He had a strained relationship with his father, Miwa's grandfather. He wanted to make up with him, but unfortunately he never got the chance.

Genius bartender, Sasakura Ryuu makes the most incredible cocktails anyone has ever tasted. Seeking his "Glass of God", individuals from all different walks of life visit his bar. With both a compassionate ear and a godly drink, Ryuu helps people with their problems.<br><br>
(Source: Anime News Network)<br>

The story of the Sasakura Ryu and Eden Hall, a small cocktail bar in the Chiba area of Tokyo, where troubled customers come for the "glass of the gods," which with Ryu's assistance helps them to resolve their often highly emotional problems. 

Miwa Kurushima no Chichi