Shizuki's father and was one of the leading wine collectors in the world, with his entire collection said to be worth around 2 billion yen at the current market price. At age 67, he died of pancreatic cancer before the beginning of the story and left a will that initiated the "Drops of God" search, with the underlying purpose of providing guidance to his two heirs, Shizuku and Issei.

(Source: Wikipedia)