Souma Minato starts dating Shiina Rio, a beautiful girl in his class. However, their dream-like days don't last even a month, as he is dumped. In his despair, he meets Koizumi Koyori, a classmate who has also just experienced a broken heart. While both of them are carrying the pain in their hearts, they develop an ambiguous relationship that is neither friendship nor romance. A slightly awkward coming-of-age story that begins with a broken heart.