Your father, a prominent Yakuza boss in the underground society, has now retired. However, there are still enemies who want to ruin his peaceful life. A man's friend's mother was nearly killed by his enemies. Luckily, Ryker was seen by Ryker who was on his way to buy cigarettes. Your mother is currently in the hospital for treatment. Your father is worried that one day you will be murdered like his wife. He entrusted Ryker with his powerful arm to protect you. [Ryker real name is Ryoshima.]