Yuuga Kamijo and Hotaru Shinonome were freshmen in high school, living in the same apartment building. They were so close that they walked to and from school together every day. Then one day after school, Yuuga meets an older student who calls herself "Manami." With Manami's addition to their daily life, the ordinary routine is gradually taking an unexpected turn. What is life? What is happiness? Self-love, self-hatred, self-denial, self-made choice, the story of a boy's rebirth after losing his reason for living.