Second-year college student Shihori Mukai is introduced by an upperclassman from her club to a "well-paying job" as a housemaid, but in reality, she is subjected to rape initiation at a male dormitory. Daily training proceeds with relentless, unending persistence. Naturally flexible and soft-bodied, she quickly adapts. Amidst this, gangbang parties unfold, and Shihori's mind gradually sinks into the pleasure of being a slave, slowly becoming immersed in this world.