Sakura Miura stars in the first live-action porn adaptation of Yuzuha's bestselling erotic manga, filmed in 4K. A shy, quiet adult library-monitor character becomes aroused when a reserved young man stares at the full breasts she cannot hide. She nervously flashes her panties to invite him, and their pent-up lust erupts into nonstop sex. Soon the introverted pair are secretly rubbing their genitals together in the empty library after hours as their private encounters grow more intense. Which one of them is truly drowning in lust?