Kiri-sensei got dumped, he asked if there was a man who was more unlucky than him, then he came upon Raion-san breaking off with his wife. Then they did it. Kiri-sensei works in a Kindergarten where Taiga goes. Taiga is infatuated with Kiri and promises to marry him when hes older. Taiga is Raion's son. Things happen and they went to the aquarium where Raion confessed. Kiri said he cant and to fix things with his wife for Taiga, then ran away. The next day Taiga's mom cane to drop him off, Kiri sad. Kiri confessed he loves Raion but didn't know he was behind him. Then they get together.
Oya No Kao Ga Mite Mitai