University student Mizuho Suga (Tsubasa Honda) learns her former high school class mate Haruka Origuchi (Erina Mizuno) died from a disorder. At her pregnancy, Mizuho matches another former high school class mate Hikaru Narumi (Yuma Nakayama). Inside their school , Hikaru Narumi was famous to be a playboy. Hikaru Narumi and mizuho were in a relationship that is special. Mizuho found it difficult to create good friends, although hikaru was homeless. They kissed from the class room and went on a one day summer trip together. They weren't friends or lovers and maintained their relationship a secret. Meanwhile, Haruka Origuchi's mum tries to talk to Mizuho, presuming Mizuho was her daughter's companion. The mum of haruka asks about the boy friend of Haruka. Haruka became pregnant with her boy friend previously.