Shoma has been in love with Itsuki, the older sister of his best friend Daigo, since middle school. Shoma, who is shy and withdrawn, finally makes up his mind and confesses to Itsuki after graduating from university and finding a job in his hometown. Her feelings have come to fruition, and she has gone on several dates, and today, for the first time, Itsuki invites him to Shoma's room where she lives alone.
