In the adult-themed, dark captivity reverse harem game "Who Imprisoned Her?", Yu Sera finds herself unexpectedly possessed by the antagonist, Sera Evott. Not only does she end up in the role of the despised villainess, but she is also trapped in the same house with the male leads who loathe her. The only way to escape is to identify the person who imprisoned her. To gather information and survive, Sera must seduce the male leads. Will she manage to escape safely?