Akumin and his twin, Megumin, finally leaves the Crimson Demon Village and journey to become the Number One Wizard in the world! However, his sister is an Explosion Maniac who becomes useless after using one spell, making it hard for them to search for a party that can tolerate them. Fortunately, the two of them managed to join a party of a suspicious Adventurer, a self-proclaimed Goddess Arch Priest, and a masochistic Crusader. Unfortunately, there's an obvious reason why his sister fits well with the party. Will there going to be a God's Blessing on the Crazy Crimson Twins