君が世界のはじまり

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.