Shoma has had a crush on his best friend Daigo's sister, Itsuki, since middle school. Shoma is shy and withdrawn, but after graduating from university and finding a job in his hometown, he finally makes up his mind to confess his feelings to Itsuki. His feelings come to fruition, and after several dates, Shoma invites Itsuki to his apartment for the first time, and will he treat her with 10 years of feelings in his heart...?