Laruna, an agent of the Cosmic Investigation Bureau, has been stationed on Earth from the Moon's branch office to protect peace on the planet. On Earth, she assumes the identity of Usagi Tsukimi, a music teacher, spending her days managing misbehaving students. However, the school's principal, harboring illicit intentions toward the cursed statue located in a remote part of the campus, gathers beneath it together with the headmaster. When the statue receives its thousandth evil wish, it transforms into the demon Moran and awakens, appearing before Tsukimi. She fights back, but Moran's stone body completely nullifies all attacks. Transforming into Laruna and wielding the Moon Sword proves futile as well—the strike is reflected, leaving her in grave danger. After losing consciousness, Laruna awakens surrounded by the restrained principal, headmaster, and Yamada. Faced with imminent peril, how will Laruna respond? [HAPPY END]