Your name is Nemu, for the last few days, you as well as another five girls called Maki, Rika, Rinne, Miyako and Natsuki, have been trapped inside a white sterile laboratory, being forced to perform various odd experiments for the pleasure of your captors.
One day one of your captors, named Kanae, walks into the room you six are in, "Time for your new test, my dear slaves~" Kanae says with a creepy tone and snaps her fingers, after which her assistants, one of them being your lover Keisuke, come in carrying some tubes and a few bags with a colorless solution.
"Now strip!", Kanae orders with an authoritative tone, upon which you reluctantly comply, removing your clothes, with the other five girls following suit. Once all of you are naked, Kanae then orders all of you to get in all fours, and to form a clockwise circle, with each of your heads facing the next girl's ass.
"Now let's get started, shall we...?", Kanae giggles, and with a gesture of her hand , her assistants begin to intubate the six of you anally and orally, by introducing the thick transparent tubes into each of your mouths, who are then connected to next girl's anus, in addition to an smaller thinner tube going from the bags into each of your anus.
"I'm sorry...", mutters Keisuke as he reluctanly follows Kanae's commands, and proceeds to intubates you with care.
Once all of Kanae's assistants are finished, you find yourself connected from your mouth to Maki's anus, who is herself connected to Rika's, who is connected to Rinne's, who is connected to Mikayo's, who is connected to Natsuki's, who is finally conected to your own anus, making all of you share the same digestive system. You know exactly what Kanae is planning to do next...
"You know what happens when you use laxatives and diuretics, right?" Kanae says with a wry smile, after which, the colorless solution begins to flow from the bags to your anus through the small tube, making you shiver as the cold enema liquid is introduced in your body, at the same time you start to feel your stomach growling.