Yū Akahane moves to a dormitory room after her father's transfer from work. She is excited that she will live in the same dorm as Takumi Shirakawa, aka "White Prince." Yet, Haruto Kurosaki, aka "Black Devil", kisses her as punishment for going against him. It is Yū Akahane's first kiss. Since then, she becomes obedient to Haruto Kurosaki.
Following the story of Ran, who confronts a mysterious organization by participating in a no-rules deathmatch after discovering her missing younger sister Yuzuki is involved in a crime. With danger at every corner, Ran must trade in her boxing gloves for brass knuckles. Will she save her sister?
Setoka Tachibana is a female high school student who has confessed her feelings to other boys 12 times, but has been rebuffed each time. Her older brother Haruka Tachibana cares for his younger sister deeply, but he keeps secret from her that they are not blood related. One day, Setoka's first love Takane Serikawa appears after many years and approaches her.
