Description：Keita Amano (voiced by Haruka Tomatsu) is an ordinary 11-year-old boy. One day, Keita, who was wandering around doing nothing during the summer vacation, found a dilapidated gashapon machine under a tree. Keita twisted a gashapon with the only coin he had, and in this way, he met the monster butler Vespa (voiced by Tomokazu Seki). Keita gained the ability to see monsters and summon monsters to assist him. At the same time, he also shouldered the responsibility of recovering evil spirits. In addition to Keita, these classmates also encountered various unfortunate things during this summer vacation, including the lively and cheerful but unexpectedly venomous Kodama Fumika (voiced by Aya Endo), the huge and scary-looking but gentle Kumashima Gotaro (voiced by Toru Nara), and the materialist Imada Kanji (voiced by Chie Sato), who does not believe in monsters at all.