Tadaima Otori Komichuu desu

Wano, a serious girl, is the chaperone of Watanuki, who is always late. She has worked hard at every job she does for Mr. Tsuji, whom she has a crush on, but it turns out that Mr. Tsuji has a girlfriend! Moreover, Mr. Watanuki finds out about his unrequited love for Mr. Tsuji and ...?