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His mother's best friend, Mary, comes to look after him while his parents are away on a trip. Koji can't help but squirm at her beauty and her stimulating body, which far exceeds his expectations. Even though he wants to get closer to her, Koji, who has little experience with women, is not immune to her and can only stare blankly at Mary's every move. Wanting to make some memories, Koji comes up with the idea of ​​using her underwear as a masturbation aid, but unfortunately he is found out. Not wanting to get scolded, Koji desperately tries to cover it up, but Mary provokes him by asking, "Didn't you just want to do something naughty with me?"