As Rentarou tries to process Hakari's request to break up with her, the two of them are escorted to the changing rooms. By the time Rentarou is back in his normal clothes, Hakari is already gone, with the other girls wondering where she went. Figuring that she was taken home, Rentarou tries to call her, but gets no answer. He finds her address on photos she sent him, which leads him to a huge mansion.
Rentarou spots Hakari in one of the windows and tries to get her attention, but is forced to hide from a security guard on the property. Hakari calls Rentarou on the house phone, and Rentarou demands an explanation for her asking him to break up with her. After some pressing, she admits to having told her mother about him and the other girls he was seeing, explaining that she'll be transferred to a new school and her mother will do anything to keep Rentarou out of her life. Her mother then takes the phone to reaffirm her daughter's story before hanging up.
Rentarou's efforts to get her attention only alert a security guard, who again tells Rentarou to stay away from Hakari. Meanwhile, Hakari begs her mother for forgiveness, with the latter threatening Rentarou if she doesn't stay away from him.
As Rentarou wanders through town, frustrated at how much of a formidable opponent he's up against, he spots a pink four-leaf clover growing up from a sidewalk crack and decides to take his chances to try and rescue Hakari. He explains the situation to the girls, who all decide to join in the mission alongside him.
Rentarou and the girls infiltrate the Hanazono residence to rescue Hakari. Rentarou tries to get Hakari's attention by throwing a ball at her bedroom window so she can grapple down with a rope, but he misses the window and the ball lands in the paws of the cat of a wealthy family. They lose the ball when a pair of security guards spot the cat and try to coax it inside by playing with the ball. Nano deduces from the cat's presence that the house has a pet door, through which she manages to unlock the door by flinging pebbles at the lock through the pet door.
Entering the mansion, the group is suddenly confronted by the dog of a wealthy family. Everyone except Shizuka makes it outside, with the latter laying herself down in front of the dog so the others can get through. The dog begins licking Shizuka, falling on instincts to protect weaker creatures. Kusuri slips a sleeping drug to Shizuka to subdue the dog, but Shizuka misinterprets the instructions and drinks it herself. But the dog knocks itself out by licking Shizuka's face.
After awakening Shizuka with the neutralizer, the group comes down to a long hallway. Before they can move forward, though, the cat of a wealthy family triggers an alarm, revealing that the hall is lined with infrared sensors. Kusuri offers up a dose of eyedrops for seeing infrared light, which she was planning to submit to an overseas pharmaceutical company as part of a job application before deciding to rescue Hakari. Rentarou puts the drops in his eyes and quickly sees that the entire hallway is stacked top to bottom and front to back with infrared sensors.
The story thus far: this is impossible even for Tom Cruise.
As Rentarou surveys the infrared sensors, he realizes there's a gap near the ceiling due to a set of chandeliers. This means they can climb above the sensors to get past them. But the hallway is too wide for one person to climb up, so two people need to work together to be able to climb up. Nano determines that Karane would be the only one able to help Rentarou climb up the walls, and she ties the two of them together for the task.
The duo slowly work their way up the wall and over the sensors. During the maneuver, Karane's shirt starts to ride up her body, causing Rentarou's face to touch her stomach. Because the eyedrops prevent him from seeing non-infrared light, he doesn't know what's happening.
Eventually, they succeed in clearing the sensors and make their way into Hakari's room. Before they can rescue her, however, an alarm triggers, summoning the guards to the room. Karane and Rentarou are quickly captured by Hakari's mother Hahari and escorted to her chamber, leaving Hakari to bemoan how much of a burden she feels to Rentarou.
Meanwhile, Rentarou attempts to plead his case with Hahari, who brushes off his "sugarcoated" words, believing that Hakari would make the same mistake that she did as a teenager, having gotten herself pregnant at the age of 13 with a terminally ill classmate and being forced to raise the child all by herself. While moved by her life's story to the point of tears, Rentarou insists to Hahari that his feeling for Hakari are genuine even with all the other girls he's dating. At this point, the eyedrops wear off, allowing Rentarou to see Hahari's face and—ZING!!
Hahari suddenly confesses to Rentarou, surprising Rentarou and shocking Karane. She quickly rerails the discussion, deciding to subject Rentarou to a Lie Detector test, hoping to prove his insincerity to Hakari. Rentarou, however, sees it as a chance to prove his sincerity to Hahari. But first, he asks Hahari to prove the machine can be trusted. To this end, Hahari subjects Karane to the machine first, since she's the only person present who can provide an objective assessment.
The machine demonstrates its effectiveness when Karane hems and haws an answer about her bust size, and demonstrates the degree of truth needed to pass when Karane is asked if she likes Rentarou and has to answer with a Title Drop. Despite the machine's strength, Rentarou passes the "pest trial" with flying colors.
As Hahari attempts to dismiss the results of the interrogation, a maid bursts into the chamber and informs Hahari that her daughter is trying to jump out the window. Karane immediately takes Hahari hostage and orders Rentarou to rescue Hakari. As he leaves to find Hakari, Hahari tries to drag herself to her daughter's room with Karane trying to hold her back.
Rentarou manages to talk Hakari out of jumping out the window, but it's too late. She loses her footing on the outside ledge, forcing Rentarou to grab her to stop her from falling. As Hahari reaches the room with Karane being dragged behind her, the guards rush forward to pull the duo back inside, but they both fall. Only with a swift kick to the outside wall does Rentarou manage to redirect the fall into the fountain of a wealthy family.
The other girls emerge from the bushes and rush to their aid, with Hahari and Karane exiting through the main door. Realizing that Rentarou was truly honest about his promise to risk his life for Hakari, Hahari asks him to take care of her daughter, with Rentarou promising to take care of both of them and accepting her earlier confession, to the shock of all the other girls.
With the night no longer young, Hahari invites Rentarou and the girls to spend the night at the mansion.
The girls start cleaning themselves in the bath of a wealthy family, with Karane redressing and leaving when the girls start comparing bust sizes. Regrouping with Rentarou, she starts vigorously rubbing his stomach when she remembers his face touching her stomach during the climb above the infrared sensors, only snapping out of it when Kusuri emerges from the bath and tries to join in on what she thinks is a game of sumo wrestling.
Afterward, Hahari provides pajamas for everyone for a dress up show. The ensuing Cuteness Overload causes Hahari to get a Nosebleed, and during a trip to retrieve some water, she takes Rentarou to her room and starts undressing him. A scream from Rentarou prompts the other girls to think that Hahari is trying to get Rentarou's virginity, but when they get there, they find Rentarou dressed as a girl, causing him to pass out.
Hahari decides the best way to revive him is to dress up Nano as a prince and have her kiss Rentarou, the ensuing scene causing the other girls to start drooling. As Rentarou regains his senses and leaves to take a bath, the Hanazonos follow after him with a coil of rope, intending to peep on Rentarou taking a bath.
The story thus far: the perverted mother and daughter want to see Rentarou's privates. All the other girls decide to tag along as well, with the sole exception of Shizuka, who gets tied up in a blanket so she can have her purity protected. Rentarou, meanwhile, already expects unwelcome visitors during his bath time and has a towel wrapped around his waist to protect his decency.
The girls' first plan is to lower Kusuri down to a window overlooking the bath, but Kusuri can't see anything through the steam. Rentarou then catches a glimpse of a scary face and screams, forcing a retreat. At the same time, Shizuka is fearful of what will happen if the other girls succeed in peeping on Rentarou and tries to roll her way to the bath to stop them.
One of Hahari's maids escorts the group up to an attic above the bath, with the cat of a wealthy family following behind them. The cat causes a ruckus in the attic, causing Rentarou to think there are ghosts trying to talk to him. At this point, Shizuka reaches the top of the stairs above the bath and gets pushed down by the dog of a wealthy family. The rope holding Shizuka snaps and Shizuka plunges into the bathwater, scaring Rentarou and giving Shizuka a Nosebleed when she sees his privates.
The rest of the girls emerge from the attic, having realized the cat had joined them. They try to hide their escapade as a game of hide-and-seek, but Karane blurts out that they were trying to peep on him taking a bath, prompting Rentarou to lecture them while Shizuka recovers from her episode.
After Hahari steps out of a card game, Rentarou finds her at an altar for a young boy who turns out to be Hakari's father. Recalling what she told him before their eyes met, Rentarou gets her to open up about her fear of disrespecting her late boyfriend's memory by falling in love with Rentarou. Rentarou tells her there's nothing wrong with loving him on top of loving Hakari's father, and she can still have genuine feelings for both, sealing his words with a kiss.
Later that night, Rentarou crosses paths with the ghost of Hakari's father. While he is initially angry at Rentarou for taking his girlfriend and daughter, Rentarou placates him with his sincere feelings for both of them. "Father-in-law" thanks Rentarou for helping Hahari move on from his death, and Rentarou thanks "Father-in-law" for Hakari and Hahari, causing the ghost to be brought to heaven free of his dying regrets.
The next morning, Rentarou and the girls return to their homes to collect their uniforms and head off to school. But once they get there, they discover that Hahari has bought out the school and become the new chairwoman so she could spend time with Rentarou, who detoured to the mansion on his way to school.
Hakari gathers the girlfriends on the rooftop to discuss the possibility that their relationship with Rentarou might enter the "fatigue stage", as all of them (except Hahari) have been dating him for three volumes, which Hakari considers three months in manga time. To combat this problem, Hakari has asked Kusuri to develop a brand new drug - the "reborn as a new you" drug that should eliminate the fatigue stage. Unfortunately, Kusuri makes a mistake, and the drug blows up. Rentarou hears the explosion and races to the roof to check on his girlfriends, only to discover that they have all swapped bodies with each other!
After a few seconds, it's established that Hakari is currently inhabiting Nano's body, while Kusuri is inside Hakari's body, Hahari is in Kusuri's body, Karane is inside Hahari's body, Shizuka is inside Karane, and Nano is inside Shizuka. With that resolved, Rentarou wonders how to get the girlfriends back to normal, as Kusuri lacks the supplies needed to make the reversal drug. Shizuka suggests headbutting each other, which has no effect. Hahari then comes up with the idea for the girls to kiss Rentarou. The second she does so, however, her soul is ejected from Kusuri's body. This causes Kusuri to realise that their souls are currently in such an unstable state that a kiss would make them so lightheaded the souls would slip out of the wrong bodies and into the right ones.
Not seeing the point in wasting time, Nano is the second to kiss Rentarou, followed by Kusuri, Shizuka, Karane and finally Hakari. As Kusuri hypothesized, this causes the souls to return to their rightful bodies. Afterwards, Hakari asks Rentarou how he liked the girls when they weren't their normal selves. Rentarou states that, while it made his heart go crazy, he prefers the girls as their own selves. Overwhelmed with happiness, the girls all initiate another kissing spree, this time in their own bodies.
Rentarou is in Hahari's office with severe bruises, which he obtained from Karane after accidentally falling onto Hakari's chest. Hahari lets him take a short rest on the sofa, then proceeds to put his head on her lap and gently pet him. When he expresses concern, she tells him that it's OK to be indulged every so often, then gives him a hug...and proceeds to lift her shirt, exposing her breasts. Rentarou is shocked, but once Hahari explains that it's just a little bonus for the readers, he can't resist groping her and putting his face in her chest...
Or at least that's what Hahari is dreaming about, having fallen asleep playing house.
- All Just a Dream: It turns out Rentarou coming into Hahari's office and groping her was just a dream Hahari was having.
- Amazingly Embarrassing Parents: Hakari is embarrassed about her mother buying out the school just to spend time with Rentarou.
- Anger Born of Worry: Karane slaps Hakari and calls her an idiot for her attempted suicide.
- Blood from the Mouth: Rentarou collapses to the floor and starts spewing blood when Karane says that she likes him and the Lie Detector registers her answer as false. He only recovers when she says that she really, really, really, really, really loves him more than anything else in the world and the machine registers her answer as true.
- Clingy Jealous Girl: Karane thinks Hakari is trying to kiss Rentarou in the middle of the night, but she turns a blind eye when Hakari says she was feeling restless about her fear of not seeing Rentarou again.
- Contrived Coincidence: Subverted. Rentarou finds it too convenient that Kusuri had a very specific drug for a very specific plot development, even expressing doubt about the situation going over well with the readers. However, it’s soon revealed that Kusuri made the eye drops as part of a job application before she heard about Hakari’s situation.
- Despair Event Horizon: Hakari reaches hers upon seeing Rentarou and Karane being dragged away by her mother's guards.
- Did You Actually Believe...?: Hahari mocks Rentarou for thinking that his "sugarcoated" words would impress her.
- Dragged into Drag: Hahari forces both Rentarou and Nano to cross-dress.
- Early-Bird Cameo: Mei makes her first appearance at the end of Chapter 20.
- Eek, a Mouse!!: The girls react this way to being touched by the cat, thinking that a mouse was the culprit.
- "Eureka!" Moment: Rentarou wonders why the ceiling is suddenly less high than it was before he took the eyedrops. Then Kusuri mentions the chandeliers, and Rentarou realises that the sensors can't be placed in places where the chandeliers would get in the way.
- Eye Pop:
- Karane does one when asking Nano just how she managed to open the door.
- She does another one when Hahari tries to dismiss the results of the machine.
- Hakari does one upon learning that Hahari confessed to Rentarou.
- Kusuri does one when she sees Rentarou and Karane rolling around on top of the bed.
- Karane does one when she sees Rentarou's spirit leave his body.
- Forgot I Couldn't Swim: Shizuka jumps into the pool in an attempt to help Rentarou and Hakari...and has to be rescued from drowning by Kusuri.
- "Freaky Friday" Flip: The girls switch bodies with one another in Chapter 23 due to Kusuri's drugs.
- Hyper-Awareness: Rentarou manages to deduce who is who in Chapter 23 based on their mannerisms.
- Idiotic Partner Confession: Maybe not 'idiotic', but Karane's the one who reveals the girls' plan to spy on Rentarou in the bath.
- Imagine Spot: Shizuka has one where first Rentarou, and then the other girls, are dragged across the city then executed as a result of the girls successfully peeping on Rentarou.
- Irony: Everyone except Shizuka wants to see Rentarou's genitals. Shizuka ends up being the only girl to actually see Rentarou's genitals.
- I Will Wait for You: Karane vows that she will wait for Rentarou to come back for her forever.
- Lap Pillow: Hahari gives one to Rentarou in her dream, and Rentarou gives one to Hahari in reality.
- Marshmallow Hell: Hahari gives Rentarou one while hugging him after he accepts her confession.
- Mundane Solution: Rentarou already suspects that the girls want to peep him. So he wears a towel while in the bath.
- Not So Above It All: Even Nano is scared of mice.
- Oh, Crap!: Rentarou's reaction when he realizes that Shizuka is still trapped in the house with the dog. He has the same reaction when he sees just how many infrared sensors are in the hallway.
- Paper-Thin Disguise: The girls waiting outside the mansion pretend to be cats to avoid the security guards. Shizuka’s disguise has her "talking" about cats, but the guard still falls for it.
- Prefers the True Form: After the girls recover from the "Freaky Friday" Flip, Rentarou says that while seeing the girls' personalities switched around made his heart go crazy, he still prefers the girls as their usual selves.
- Sacred First Kiss: Hahari reveals that she never kissed her first love, as he told her to save her first kiss for the one who would never let her be alone again, then gives the kiss to Rentarou.
- Solo Mission Becomes Group Mission: Rentarou initially planned to rescue Hakari on his own, but when he tells the other girls about it, they insist on coming with him.
- Something Only They Would Say: Just like in Chapter 13, Kusuri gives herself away by referring to herself in third person.
- Shout-Out:
- The "story thus far" panel in Chapter 17 mentions Tom Cruise.
- Karane quotes Hanzawa Naoki in Chapter 20.
- Rentarou mentions Tom Cruise in Chapter 21.
- Rentarou responds to Karane commenting on the Hanazonos’ bell peppers with “Are we in Nausicaä of the Valley of the Wind right now?”
- Stumbling in the New Form:
- Hakari pretends to be in this predicament when she has a "Freaky Friday" Flip with Nano. But the two girls have very similar builds that wouldn't lead to such issues; it's really an excuse to flirt with Rentarou.
- Karane, with her A-Cup Angst, has a "Freaky Friday" Flip with Hahari, who has big boobs, causing her to have trouble standing up straight.
- Sure, Let's Go with That: Kusuri thinks that Karane and Rentarou were sumo wrestling, and Rentarou goes along with this.
- Talking Down the Suicidal: The girls try to stop Hakari from jumping out her window alongside a security guard.
- This Is Wrong on So Many Levels!: All the other girls are shocked at Hahari falling in love with Rentarou.
- Time Skip: Chapter 18 skips the questions Hahari asks Rentarou, and just shows his answers.
- Title Drop: Rentarou drops the title of Chapter 19 when he vows to protect Hakari "even if it costs me my life".
- Villainous Breakdown: After the interrogation backfires, Hahari falls into a Pose of Supplication attempts to dismiss the results as the Lie Detector being a machine.
- Wham Episode: Up until now, all of Rentarou's girlfriends have been girls his own age. Chapter 17, however, shows that neither older women nor relatives of existing girlfriends are off-limits.
- Wham Shot: The very last panel of Chapter 17, where Rentarou Zings with Hahari.
- What You Are in the Dark: Kusuri could have easily stayed silent about her drug that enables people to see infrared light and mailed it in to the company she wants to work for. She doesn't even hesitate before giving it up so that the group can rescue Hakari.
