Ayumu-sensei to Hikaru-kun  

あゆむ先生とひかるくん

A nursery school teacher named Ayumu discovers someone suspicious at his workplace. It turns out that the person is none other than a well-known actor called Hikaru Momose, who was once one of Ayumu's students as a tutor. They had made a promise to get married if Hikarus feelings didn't change even after he grew up.