Orion is a former hero who has been reborn in a different world he once saved as a "hero". Taking advantage of his second round of heroic heroism, he takes on the world's strongest and wisest maid who was once in the same party with him, picks up a slave girl, and trains her with "heroic-style power leveling"! Even if you are attacked by a thief monster girl, you can easily convert her and get her a friend! The former hero who never takes responsibility for his own actions, who has acquired a luxurious mansion, the most powerful equipment, beautiful women, fame, and everything else he needs to live his life the way he wants to, has started a new game of strength and fun!