Momo Ryuuju

Momo Ryuuju is a third-year high school student at Shuchiin Academy and the only daughter of the head of 'Ryuuju-gumi,' a Kanto-based underworld organization. As one of the school's feared 'Four Impossible Girls,' she carries an intimidating presence and first crossed paths with Miyuki Shirogane during her time as the student council treasurer. When the school cultural festival arrived, driven by a sense of obligation to repay a past favor, she quietly leveraged her unique background behind the scenes to assist Shirogane in carrying out a romantic scheme—cementing her reputation as a mysteriously capable and resourceful supporting figure.