Ootsuki Kousuke

Sakumi father-in-law and biological father of Koutarou and Takahiro. His wife pass away when his sons where young. Leaving him to raise his sons alone.He also has not remarried since his wife passing even though his son Koutarou recommend it.During his youth he played rugby give him a muscular body When his oldest son Koutarou leaves on a long business trip he is left with Sakumi and his youngest son Takahiro. It's shown if the player decided to go after him. He dose not mind cheating with Sakumi but dose feel disqualified as a parent.