黒川 真鈴

An idol who debuted at the age of 12. Despite her average appearance, she used her E-cup sized boobs to gain popularity, and managed to raise to the top.

However, in recent years and as Marin grew up her popularity started diminishing, and as she turned 18, she's become very desperate and worried about her future. This is the reason she wants to turn into a full-fledged artist. 

Marin is also a good singer and regularly takes lessons for it.