香椎 満里奈

Shouko's older sister and Shougo's classmate.

Shogo and Marina have known each other since childhood and are “former” playmates. They used to play together a lot in the past, but that was only when they were children.

In contrast to her sister, she is a manly woman in both tone and personality. She routinely curses Shougo and Naoya when they get excited about erotic topics.

In fact, she has been in love with Shougo since childhood, but she knows that Shougo is in love with her sister, Shouko, and hides her feelings from him.

One day, however, she discovers that Shougo, Shouko, and Hijiri are living an erotic love life together.