One day, Itsumi Shiraishi dies at Seibo Maria Girls High School. She falls off from the rooftop of a school building. Itsumi is the daughter of the administrator at the school and she was envied by all the other students there. Did Itsumi kill herself or was she killed accidentally or intentionally? At the time of her death, she held a lily of the valley flower in her hand. A rumor spreads that somebody in the literature club killed Itsumi. Itsumi was the president of the literature club. A friend of Itsumi, Sayuri, is now the president and she holds a regular club meeting, reading stories written by members.
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.