Kenichi, who was tired of his noisy mother trying to study, decided to have Yuka, who happened to visit her and come to play, to study. Kenichi is sick of Yuka, a beautiful, sexy, and perfect adult woman who is a talented woman from a national university. After seeing Kenichi's naive reaction, Yuka makes fun of her saying, "Let's teach girls rather than studying ...". Kenichi, who is completely obsessed with Yuka's small devilish charm, sneaks into the bathroom to look into Yuka while taking a bath.