Standing at just 148cm with a tiny, doll-like body and the pure, innocent looks of an idol, Ruka possesses an incredibly erotic nature—she instantly loses control of her bladder with even the slightest touch. Once her partner realizes her hypersensitive condition, they eagerly take advantage, deliberately teasing and guiding her toward pissing, which she happily goes along with. Her fearless and bold attitude in these situations only adds to her irresistible charm.