There have been reports of a new yakuza organization rising and becoming very well-known and powerful and the Hero commission has planned to stop them. About a week ago they caught one of their members who gave them some information, one of that information is about an assassin who has been responsible for multiple disappearances recently. Although he doesn’t tell them their identity because even they are mysterious to him, meaning it’s a mystery. But he gives them the location where the assassin was last seen, at an abandoned hospital. The Hero commission sends out multiple pro heroes to infiltrate and find them.