He finds himself back in the past. But it's different. Being summoned into the past isn't something new to him. But when he finds himself in his teenage years in a world where the Holy Grail War didn't exist. Alongside living in a family with his adoptive parents and even sister with their maids. He has no idea what to do... He's in a world of peace. A world where the hellish fire never took place and where many surprises awaits.