Nao Mamiya

Nao Miyoshi (Born Mamiya) is the main female character of the manga Kanojo ni Naru Hi. She spent most of her life in the past as a boy, but due to a genetic phenomenon, it is revealed that 'he' is actually a she. She is the wife and the childhood friend of Kyosuke Miyoshi. She is the mother of Nene Miyoshi.

Personality
Mamiya is shown to be calm at most times. She is very playful and comfortable around boys. She is not a shy person. Mamiya, as described by Miyoshi, can get arrogant and stubborn. Despite her maintained composure, she can break down and cry when she reaches her peak. The thing that she can't stand the most is being ignored by Miyoshi.

Appearance
Mamiya has a slim figure and light skin. As a boy, she had short pale reddish hair. As a girl, she has long, wavy red hair. She developed breasts.

Background
She looks up to her mother. Her mother was into education, and she yelled frequently at Mamiya to study. However, her mother left with another man. This caused Mamiya to try her best at everything, in hopes that her mother will return.

Her father remarried with a new woman, and Mamiya gets a little -sister.

Volume One
For the first 16 years of her life, as a boy, she used to compete with Miyoshi at everything - and she always emerges as the winner. However, one day, she collapsed and was hospitalized. After that, it is revealed that 'he' was genetically a girl. Mamiya continues to live her life as a girl. She teases and intimidates the gynophobic Miyoshi. Despite her playful attitude, at a time, she broke down in tears after being ignored by Miyoshi. She continues to flirt with Miyoshi. However, Mamiya forgets that she is now a girl, and that she has to be more careful around boys. In chapter two, she is saved by Miyoshi after being in a boys' room.

A few days later, she was confronted by a group of girls for flirting even though she was originally a boy. At another time, Mamiya got jealous when a first-year student and Miyoshi hung out together. However, Miyoshi rejected that girl's confession. In chapter 4, Mamiya got overworked. As Miyoshi accompanies her, he reveals that he likes her. At the end of that chapter, Mamiya collapses.

In chapter 5, it is revealed that her hormones are going through a shock due to the gender change. She was visited by Miyoshi a lot, but soon she told him to forget about her and move on. When Miyoshi visited her to convince her to go through the medical treatment, she broke down to tears. She said that she couldn't stand to lose Miyoshi. After the both of them reconciled, they kissed. They began to hung out together.

5 years later, it is revealed that as she undergoes the treatment, she has continued sleeping - she entered a cocoon. After Miyoshi said that he will still love her, Mamiya comes out as a girl again. They reunite. At the end of chapter 5, Mamoya finally said that she loves Miyoshi.

Their love life continues, and Mamiya's emergence was kept a secret. But as the tension and problem arises, they decided that it was not going to be a problem, and her emergence was revealed to public. In a chapter, their love reached the point where Miyoshi proposed to her. Mamoya agreed, but became more hesitant as she was traumatized by the incident when her mother left the man she loved. However, Mamoya and Miyoshi soon resolved the problem, and they got engaged. After they got engaged, Mamiya started to call Miyoshi with his first name -  . She continued to remind Kyosuke to call her Nao.

At the end of chapter 17, they get married.

In chapter 18, she learns that she is 8 weeks pregnant.

In chapter 20, she gives birth to a girl. She and Kyosuke call her Nene.