Reika Fujisaki, the jaw-droppingly gorgeous chief of the product development division of a confectionery company, and her handsome and talented subordinate Tsukasa Hasegawa have many sweet first experiences as they start dating. In their blissfulness, they fail to see that now Kobayashi-san, who is in their department, has found out about them dating in secret! The couple faces one unforeseen challenge after another, but after Hasegawa-kun invites Reika to a hotel date for Valentine’s Day, they also finally share their first…?! The series’ sweet and pure climax!