Chiharu's energetic sister, she looks like a short-haired cheekier version of Chiharu. Despite being fully aware of Densuke and Chiharu's feelings for each other, Yuriko likes trying to get Densuke's attention, most often attempted by jumping on top of his face. She also likes rubbing her sister's breasts to tease her because of her own lack of giant breasts, as she only has a 73cm (A-cup) bust. Densuke finds out later in the manga that her "weakness" is her butt, which is often focused on in both media. She often greets Densuke by jumping into him, landing seated on his face and usually leaves her buttocks or crotch in his face.