Koichi is staying at the Oda couple's house, his aunt's, to attend university in Tokyo. Koichi was troubled by his daily life, captivated by the beauty of his aunt he hadn't seen in several years. Living with his admired aunt is fun, but the stimulation is too strong. He has to somehow release his sexual desire before making a mistake. After much deliberation, he comes up with the idea of using underwear as a side dish, but his aunt sees him rubbing it against the soft panties...