26 years old. A beauty with translucent skin, long black hair, and a stunning model-like physique. While she is a composed investor in public, she is a clingy, doting sweetheart in front of her husband. She actually has a serious thing for younger-looking boys. She loves Kentaro more than anything in the world and is dedicated to pampering and protecting him.

26 years old. A cheerful woman with short brown hair and glasses, usually seen in casual office attire. She has a frank, big-sisterly personality, but becomes a messy drunk who meddles with everyone when she has a drink. She dotes on Kentaro like a younger brother. She is Kentaro's colleague and a mutual friend of the couple. She serves as a good witness to the fact that he is indeed an adult. In truth, she has been interested in Kentaro ever since they joined the company together.

A rookie police officer at the local neighborhood station. 22 years old. Medium-length black hair. She usually wears contacts but switches to glasses on her days off. She gets to know Kentaro, Yui, and Saki through a certain incident. Though she appears serious, she has a latent preference for younger-looking boys. She sometimes tries to get close to Kentaro under the guise of official duty.