Chen Yuan, a young boy who became an orphan due to the accidental death of his parents, was adopted by Yuichi Aoki, the president of the Yamaguchi-gumi bonding club since he was a child. However, due to the power struggle among the group members, Chen Yuan was framed for killing his adoptive father and was wrongly imprisoned. He was sent to the Kyoto Penitentiary in Japan to serve his sentence. But seven years later, a natural disaster came to this world...
