Musuko ga Osewa ni Nattemasu!

The elite salaryman Shinji is a single father. He, who strives for perfection, doesn't like his son's homeroom teacher Sakihara. He sees him only as a flashy youngster. Despite being called a monster parent, Shinji confronts him, but Sakihara ends up taking care of his "son" down there?!

(Source: Cross The Oceans)