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Momona and her friends
Momona Ichikawa
The main character of the manga. A normal high school girl who was transferred to another world. She has pretty average grades but is popular with guys because of her looks and character.
- Alternate Self: Her counterpart on the reversed world who she switches places with, or rather only minds. This Momona was a Loveable Sex Maniac who was very outspoken about her lustiness. When she was transported into the regular world she immediately tried to sleep around with guys but ended up only ever doing it with her classmate Urisugi, though she inadvertently molded him into a sex maniac like her.
- Not Himself: Kawashima and Kanzaki both notice her sudden personality change, with the former wondering if her illness at the beginning of the story caused brain damage.
- Oblivious to Love: In her world at least, she's unaware that Urisugi has a crush on her, until he tells her himself. In flashbacks to the main world, before this is revealed, they bump into each other while he's renting adult movies, and she just thinks he's a pervert with an awkward pained look on her face, whereas he's blushing.
- Only Sane by Comparison: Compared to most of the girls in her class by the grace of being from our world, she's the Only Sane Woman. In conversations, it is shown that her counterpart was just as perverted as the rest of them.
- Passionate Sports Girl: She is pretty good at sports and often plays badminton in a gym.
- Real Men Wear Pink: Gender-inversed and zigzagged. On one hand, hobbies considered "girly" in our world like cooking, sewing, or bug-catching are considered "manly" in the new world. On the other hand, she got interested in a bunch of more traditionally "manly" hobbies like fishing to get herself distracted from the new world craziness.
- Unexpected Virgin: The reverse world Momona in regular Momona's body finds out the hard way that her body is still "intact" unlike hers (due to excessive self-love), making for an unpleasant first time having sex, torpedoing her confidence and leading her to stick with the same guy. Regular Momona is none too pleased to learn this from the guy himself.
- Unknown Rival: to Amamiya. Momona just wants to play badminton with a decent partner, but Nanami thinks she does it deliberately to compete for boys' attention.
Ayu Kawashima
Momona's first friend. A smart but extremely perverted girl.
- Caught with Your Pants Down: Apparently she indulges in binge-masturbation sessions to the point that she falls asleep doing it, and she has unfortunately been discovered by her mother a few times.
- Girlish Pigtails: A braided variant, with the braids more prominent in the doujin version.
- I'm a Man; I Can't Help It: Gender-inverted. She sincerely believes that women are biologically programmed to be lustful, so she has nothing to be ashamed of. Naturally, she sees men as The Unfair Sex.
- Lovable Sex Maniac: She is the most perverted girl in the class, is regularly seen reading porn in school, and is not hiding her libido. She also bangs Urisugi each time she could afford it. On the other hand, she is always there when her friends or acquaintances need help (like when she prepared the notes for hospitalized Momona or helped her and, earlier, Nanami to get some ero mags.)
- In the original doujin version, Urisugi dubs her the "lewd semen demon" after she sleeps with him over 30 times in just 4 months, far more often than any other girls do and more times than all of them combined have.
- Nerds Are Sexy: Not that boys in the class care because of her personality. She has the best grades out of the main trio and Momona and Hanako often ask her for notes. And also pretty smart. Still, she also has good looks and Urisugi enjoys doing it with her the most.
Hanako Kanzaki
Momona's second friend who works in her family flower shop.
- A-Cup Angst: especially compared to her friends.
- Do Not Call Me "Paul": she hates her first name and prefers to be called by the last one.
- Lousy Lovers Are Losers: She's a lousy lay who leaves Urisugi unsatisfied due to her poor sexual stamina and uninterest in doing anything else after she climaxed.
- Speed Sex: The gender-inverted premise means that it's Urisugi who gets frustrated when she climaxes and gets too tired for more action pretty much immediately.
- Unlucky Everydude: Gender-swapped example. She is bad at both studying and sports, not as handsome as her friends, and is bad at sex.
Haruo Urisugi
He really gets around
Momona's classmate who also got transferred to another world.
- Friends with Benefits: Before he was transported, he became one to the Ichikawa of the reversed world after she and our Ichikawa switched places, or rather minds. She had tried to be promiscuous with boys but he was the first and only one she slept around with since she lost the confidence to seek other partners after their first time. But they did sleep around a lot, which ended up rubbing off on him.
- Hidden Eyes: The author deliberately tried to invoke a featureless hentai protagonist look, because that's indeed what he used to be. Though, his eyes can be seen in some panels.
- Hooker with a Heart of Gold: What he essentially is. Men in this world are supposed to be chaste and pure, so his being so forward about sex, even if it's for money (he'll even offer himself up for free if he feels like it), is basically unheard of. He's also extremely generous with his "clients" (because he feels he's the one that should be paying). Kawashima thinks of him as a "slutty angel."
- Hero of Another Story: Not so much him, but the counterpart he swapped places with, who we can only assume is in a similar position to the Momona we've been following.
- Lovable Sex Maniac: He does not mind selling himself (and pretty cheap) to the girls. But he does not make fun of Hanako's look or her being a "speed-shooter" and he even went on a date with her without any extra benefit in mind.
- Love Confession: He admits to our Ichikawa that he was all too happy to be used by her reverse world self because he's always liked her, which leaves her a bit shaken.
- No Name Given: In the original doujinshi series he was unnamed.
- Not Himself: When visiting his mother she notices a difference in his behavior, such as a more defined physique and lack of physical decency, but like Ichikawa's friends, she believes he may have suffered brain damage from his illness.
Nanami Amamiya
The most popular girl in class
Popular girl in Momona's class.
- Brilliant, but Lazy: She is good in both sports and studying, but only makes enough effort to keep her popularity and she hates training more than necessary.
- Covert Pervert: She is interested in boys, but she doesn't want to be associated with Kawashima or friends. However, after Kawashima helps her buy her first ero-mag, (and shows her the wonders of the internet), they begin to bond.
- Cuteness Proximity: She adores fluffy pets but her parents hate animals so she has to seek to pet them elsewhere.
- Passionate Sports Girl: Pretends to be one. In fact, she only plays badminton to get boys' attention.
