Shirakawa Momoyo

"Within you, is there still a Heart of Justice left?"

Shirakawa Mikuri's older sister and Hayato's cousin. She is shorter than Mikuri, has a slim figure and an average chest size. On behalf of her parents, who claim to be in the countryside at the moment, she takes over their duties as an acting landlady.

A young genius inventor and a scientist who has created many inventions and obtained her own licenses. A student and an inventor, although she seems to be occupied with being a landlady, she actually does her work pretty well, sharing the responsibility with her sister Mikuri.

In her own laboratory​, she always spends time there naked wearing only a white coat. Also, due to her aloof personality, she often involves those close to her in the name of experiment, which ends up causing a commotion.