Sakuta Azusagawa, a second-year high school student lives in a special place called Fujisawa. He is in a relationship with his upperclassman and girlfriend, Mai Sakurajima. Things take a complicated turn when he meets his first love, Shoko Makinohara, who for some reason has two versions of herself - an adult version of Shoko and a junior high version. Sakuta is fooled by the adult Shoko who reluctantly ends up living with him which causes a strain in his relationship with Mai. Sakuta learns that junior high Shoko is diagnosed with a serious illness and this causes his scar to hurt again.