INFO:

Karin Oriyama, 16 years old. She is in high school and... she's about to get married! The person she marries is her first love Nao Tsurugi (Kento Nakajima). He is a popular senior in high school. ... Karin loves him truly, but Nao doesn't love her at all. Their marriage is a secret, but Isuzu Ebina (Yuri Chinen), who holds feelings for Karin, learns of their marriage.