At midnight, in a residential area of Osaka, a middle-aged man is murdered. The person who killed the man is a high school student. En is a 2nd-grade high school student. She spends her boring days with her friend Kotoko, who tends to change boyfriends frequently. Kotoko falls in love with Narihira at first sight. Narihira is a soccer player at their high school. Since then, the relationship between En and Kotoko changes.