Juri and Yuna, who met by chance and are completely different types, Juri's non-blood brother Rio, and Yuna's childhood sweetheart Kazuomi, are first-year high school students living in the same apartment and attending the same school. Yuna admires Rio, Rio has feelings for Juri that cannot be expressed, Juri hides a secret, and Kazuomi witnessed a secret. Their respective feelings are entangled in a complex way, and the more they miss each other, the more they miss each other - a painful love begins.