A small star of exorcism that hunts nightmares that nest in people's dreams. While attending junior high school with his partner Koi and Babuki's Kyun, Yotobari Chiho is very active as an exorcist at night! However, in addition to exterminating the nightmares, Chiho also has a purpose of searching for his younger brother whom he lost in his dreams... One day, he meets Seiichiro, a high school student who is wandering around in other people's dreams.