Satou Kazuma, a game-loving shut-in whose life was supposed to come to an abrupt end in a traffic accident(?!), is reincarnated into another world by chance, taking the goddess Aqua with him. Kazuma's excitement at the prospect of an adventurer's life and becoming a hero soon becomes plagued by troubles. He forms a party with three incredibly unfortunate people: the troublesome goddess Aqua, the chuunibyou wizard Megumin, and the masochist female knight Darkness, all of whom are highly skilled but also incredibly unfortunate. He defeats the Demon King's executives, plays with the princess, and sometimes even dies… This story is just one chapter in the adventures of Kazuma and his friends.