Kasumigaoka Haruharu, eldest son of the Kasumigaoka family, goes to school by day and exorcises demons by night, leading a busy but fulfilling life.
He keeps a little notebook, where he writes down small wishes, such as:
He hopes his younger sister, Kasumigaoka Utaha, will work harder and stop lying around like a dead fish, waiting for him to take care of her;
He hopes there will be fewer and fewer demons, so he can take it easy;
He hopes the quintuplets he teaches will get better grades;
He hopes his junior, Katsura Kotonoha, won't hide a cleaver under her clothes when she talks to him.
But his greatest wish right now is for the person he likes to accept his confession, so they can start dating.
Strange, why did he get a chill down his back when he wrote that wish down?