Oka no Ue no Rakuen

From Forever More : English teacher Kijima-sensei and his six years younger colleague, PE teacher Ono-sensei are working in an all-girls school on a hill. After Kijima overhears a girl confessing to the PE teacher, Ono asks him for advice. The two get closer bit by bit and in a conversation Ono confesses that he has a one-sided love. Who is the person Ono has one-sided feelings for and how will Kijima handle the matter...