A relative, Aika, comes to stay with a boy who is home alone for a week. While the two of them are talking until the parents return, Aika spills her tea, and her healthy, tanned body becomes wet and transparent. The first-time feeling of irritation stirs up fantasies... Noticing the boy's fantasies, Aika uses every trick in the book to seduce him! She teaches him amazing techniques that will inevitably make him lose his virginity, and an unforgettable 7-day period begins, including his first experience and creampie!