Becoming a Girl Day

Kanojo ni Naru Hi
彼女になる日

Spin-off

The Day He Becomes a Woman — Another
Kanojo ni Naru Hi: Another· 彼女になる日 another
manga

Sagara becomes a girl in his third year of middle school, and has to deal with his crush on Kurosawa, a female classmate. *Note: Includes 7 extra chapters*