Takahashi Kenji is a High School Student who is bored of his life. He posses innate Super Human Strength but he can't use it as restricted by his grandparents. But his best friends Suzuki Sumiye & Yamamoto Kanae are aware of his powers and try to explore it secretly during vacations.
One day, he encountered a severe wounded man who claims to be his Godfather. He guided him to ask his grandparents to explain everything. He discovers the truth about his Clan and realizes the important duty he has to fulfill.