女体淫換 ～移り変わる恥辱的好奇心～

While on a field trip to a museum, the protagonist's 4-person group accidently breaks a cursed jar due to some trivial dispute. And the following day, it seems that their minds and bodies are swapped because of the curse. Thus begins their struggle to dispel the curse in order to change back to normal.

[Translated from Offical Site]