Tenshi Ja Nai Vol 5

Tenshi Ja Nai!! by Takako Shigematsu. A Comedy manga rated Older Teen, published in English by Go! Comi.

When her parents are transferred to France, Hikaru Takabayashi gets to stay in Japan on one condition: she has to enroll at her mother's old all-girls boarding school. Hikaru hopes for a quiet fresh start after being bullied at past schools, but she soon discovers that her stunning classmate Izumi Kido, a famous model and actress, is secretly a boy. Now Izumi is determined to make sure Hikaru keeps that secret, by any means necessary.