Kazamatsuri, a modern and well-developed city known for its growing greenery and rich Japanese culture, is where high schooler Kotarou Tennouji lives, though he is least aware of the place's shared values. Satisfied with filling his pockets with frivolity, this proud and nosey boy passes his time by pestering the self-proclaimed delinquent Haruhiko and indulging in his romantic feelings for the oddball Kotori. Possessing the superhuman ability to permanently rewrite any part of his body to multiply his strength or speed, Kotarou is naturally drawn to the supernatural. A special meeting with Akane Senri, the "Witch" and sole member as well as president of the Occult Research Club, leads Kotarou to revive the Occult Club by recruiting Kotori and three other members: the clumsy transfer student Chihaya, the strict class representative Lucia, and the unassuming Shizuru. As Kotarou uncovers the hidden secrets of each Occult Club member through their shared adventures, he will inevitably encounter a fate that only he might be able to rewrite.