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.
 * Crazy Jealous Guy: The male who attacks Thammy in Chapter 13 says she is his alone. All points out to her never having dated him on her life.
 * Dude Looks Like a Lady:
 * Before his transformation Mamiya already looked quite girly.
 * Ms. Sakura is a male who cosplays as female characters, and looks very convincing.
 * 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.
 * Girlish Pigtails: Tammy wears her hair on this hairstyle. Considering she is also wearing a swimsuit that elementary schoolgirls wear, she was probably cosplaying as a little girl character.
 * Hot For Teacher: In chapter 13, Kyousuke do tutoring for elementary school students between other part-time jobs. A female student hits on him.
 * Mistaken for Cheating: In Chapter 13, Kyousuke ends up being hit on by a famous female cosplayer. When Mamiya finds him with her, she is almost showing him her breasts.
 * Nipple-and-Dimed: Averted. You do get to see Mamiya's nipples in female form.
 * Rescue Romance: In Chapter 13, Tammy seems to think she is into one after Kyousuke saves her from an attacker.
 * School Swimsuit: Chapter 13. The female cosplayer Tammy wears one during a cosplay convention.
 * 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.