During his parents' trip, Mary, his mother's friend, came to take care of him. Overwhelmed by her stunning beauty and stimulating body, Hiroshi couldn't help but blush around her. Despite having little experience with women, he found himself captivated by every move she made. Determining that making memories was important, Hiroshi decides to use her underwear as a memento but accidentally gets caught red-handed. Embarrassed, he tries to cover up but instead finds himself challenged by Mary when she asks if all he wanted was to have sexual relations with her...