Kanojo Ni Naru Hi

Kanojo Ni Naru Hi is a 2013 Shoujo manga series.

Kyousuke and Mamiya are two japanese male school friends. They're always competing against each other, and Kyousuke is constantly losing. However, in their version of our world, people's genders may change suddenly to keep the population under control. Mamiya ends up genetically changing into a girl, and Kyousuke begins to begin feeling attracted towards his now female friend.

Writing and art by Akane Ogura. Serialized on Hakusensha's Ane Lala in 20 chapters, from 2013 to 2017.


 * Accidental Pervert: Kyousuke's cousin ends up walking on Mamiya after she gets out of the bath.
 * Bi The Way: Defied. After they begin to date and Mamiya begins to show signals she may bend back into a man, Kyousuke reaffirms he will keep dating her, but Mamiya never believes in him and resists bending back until her body settles on a female state.
 * Born Unlucky: In chapter 10, Mamiya's father tells a lot of stories about freak incidents who led him to be absent of his son, now daughter's life.
 * Dude Looks Like a Lady: Before his transformation Mamiya already looked quite girly.
 * Fanservice: The manga quite indulges on it from the beginning, with Mamiya wearing a open shirt on the first color page of the first chapter.
 * Fantastic Racism: People who go through gender-bending are often discriminated in several ways.
 * Nipple-and-Dimed: Averted. You do get to see Mamiya's nipples in female form.
 * Shameless Fanservice Girl: Mamiya turns into one after becoming a girl, making Kyousuke feels jealous when other guys began to float around her.
 * Shrouded in Myth: Chapter 12. Thanks to a bunch of drunks who try to violate her inside a inn, Mamiya bizarrely becomes a figure of worship, said to be a goddess who cures fatigue that lives inside a inn.
 * Slut Shaming: Played for Laugh. Kyousuke's cousin Takahiko tells him Mamiya is not marriage material for daring to walk naked inside his boyfriend's house.
 * Stalker with a Crush: The main plot of chapter 7 involves one possibly following Mamiya..
 * The Ace: Mamiya is said to excel at everything by Kyousuke at the beginning of the manga.
 * Your Cheating Heart: Mamiya's mother infidelity is a source of big angst to her, specially when she begins to fear she is becoming like her.