Kawarazaki-ke no Ichizoku - Season 1

A college student named Mukuto takes on a summer job as a servant for the aristocratic Kawarazaki family. While working at their mansion, he enters a mysterious pavilion located on the estate grounds. Inside, he encounters several beautiful women and finds himself compelled into a series of sexual encounters. This draws him into a realm of intense passion and affection that may be an alternate reality. The nature of his experience, whether it is real or merely a dream, remains uncertain.