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.
Tropes:
- "Freaky Friday" Flip: The girls switch bodies with one another due to Kusuri's drugs.
- Hyper-Awareness: Rentarou manages to deduce who is who based on their mannerisms.
- Something Only They Would Say: Just like in Chapter 13, Kusuri gives herself away by referring to herself in third person.
- 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.
