_"Why don't the two of us date? …In secret"_ Tateishi, who works in accounting at a snack-making company, has a secret. That secret is the existence of his cute lover that he's had since yesterday. Why keep it a secret, you ask? Because his lover is his unyielding colleague from the planning department of the same company— Mitsuya! A pure office romance story about a couple who started their relationship in secret, and want to keep it that way!