Koiki Shichihenge!!
こいき七変化!!
A group of students, including Koiki, serve as the school management OSIS at Jigami. They are assigned a mission by the principal's mother to search for a hidden treasure. Unbeknownst to them, they possess a latent power that has remained concealed for some time. Part of this mystery involves a necklace, the significance of which has yet to be fully revealed.