This hard-working salaryman, dedicated to his duties, has a monthly ritual: indulging in the pleasures of an escort service. This time, he's planning a special challenge: a first-time 4P harem experience with the overtime pay he's earned. He contacts the agency, and a trio of stunningly busty girls arrives. "Hello there! I'm Mizuki! I'm Waka! I'm Riho! So, you're here for the instant service, right?" Before they even finish greeting him, they dive straight into their naughty play. "You know, we all work at the same place during the day," they tease. The blissful 4P experience flies by in a haze of happiness. A few days later, he ends up hospitalized due to illness. During his checkup, he's approached by three masked, busty nurses with a mysterious air. The salaryman's foray into the erotic world of the hospital begins...