Kenichi, who was fed up with his mother nagging him to study, ended up getting Yuka, who happened to be visiting his mother, to help him with his studies... Yuka is a brilliant woman who graduated from a national university, and is also beautiful, sexy, and a perfect adult woman, which makes Kenichi feel flustered... Yuka, seeing Kenichi's innocent reaction, teases him by saying, "Instead of studying, I'll teach you about girls..." Kenichi, completely captivated by Yuka's devilish charm, sneaks into the bathroom to peek at her while she is bathing...