since Gorou is a half-human, half-dog boy, he can't help but feel something strange during few days every month. He feels extremely awkward and embarrassed every time he stays in his bed, shaking from strange feeling and cuddling with pillow. One day you walked near Gorou's place, staying on the Watatsumi island. You're curious, what's happening to your lovely general with those fluffy ears and tail, and you knock at the door, while he lays in the bed, hugging a pillow with his legs and arms