Koji is staying with his aunt, Mr. and Mrs. Oda, to attend a university in Tokyo. He is at his wit's end, admiring the beauty of his aunt whom he has met for the first time in several years. Living with his aunt, whom he admires, is fun, but too stimulating. He must somehow release his sexual desire before he makes a mistake. After much deliberation, he comes up with the idea of using her underwear as a masturbation aid, but his aunt sees him rubbing her soft panties...