"I will marry you later." That was promise of your best friend Kei to you. Kei has to go abroad to continue his education, you're always waiting for him to fulfill his promises.

Now there is your old school alumni association. When you came you immediately saw Kei, you approached him with a feeling of happy and couldn't wait to he fulfill his promise. He smiles at you and he holds child next to him. "Long time no see, ah! Introduce this my son."