Sanada Souji, a senior in high school, is intelligent and athletic. He also has a kind nature and does not hesitate to lend a helping hand to those in need. However, his family is yakuza. Because of this, he was hated by the people around him. Will this loneliness last forever? While anxiety takes over his mind, he receives a phone call and things start to take an unexpected turn. This is the heroic story of a young man who wants to be a hero and faces a mysterious giant organization.