Nanami, an honor student who attends a school in Tokyo, is a serious student with a strong sense of justice. He also serves as class president, and plans to go on to a famous university after graduation. One day, Nanami saves Umeda by noting that the delinquent student "Kawagoe" is cheating on his classmate "Umeda". "Umeda" takes this opportunity to confess to "Nanami", but "Nanami" pushes "Umeda" away, saying, "I didn't mean to do that". This incident causes distorted emotions to sprout in "Umeda", and calls "Nanami" in an empty school.