The story follows a young man who finds a beautiful roommate named Yui to share his apartment. Desperate and with nowhere else to go, Yui agrees to a unique rental arrangement: instead of paying with money, she pays with her body. The series chronicles their evolving sexual relationship, starting from their first awkward, yet deeply arousing, encounter where he hesitantly takes her virginity. As they continue to live together, their arrangement blossoms into a raw, lust-filled affair. Yui sheds her initial shyness and becomes an eager participant, initiating sex and exploring her own desires. Viewers are treated to intensely graphic scenes of them fucking in various positions, with detailed close-ups of her wet pussy being penetrated by his hard cock. Their shared apartment becomes a playground for their carnal explorations, including passionate oral sex where she eagerly deepthroats him and he voraciously eats her out until she climaxes, and the intimate act of him cumming deep inside her unprotected.