Kazamatsuri, a modern, well-developed city renowned for its burgeoning greenery and rich Japanese culture, is home to a boy named, Kotarou Tennouji, a frivolous and nosey high schooler . Kotarou spends his days joking with his childhood friend Kotori and pranking his rival Yoshino, all the while seeking greater contentment and connections in his life. In truth, he holds a secret- the superhuman ability to permanently rewrite his physiology, which lets him modify his strength and speed to his liking. With such traits, Kotarou is naturally drawn to the supernatural, and is led to meet the president of the Occult Research Club, the “Witch” Akane Senri. But that was the beginning of a battle for the fate of the earth!