[Tentacle-wielding alien x heartbroken office lady]
Other people's misfortune is sweet... I'll give you blasphemous pleasure.
Somewhere in Tokyo:
Tonight, a sacrifice (a broken-hearted office lady) is brought to a man who has been transported to another world...
"MENU.01 Ordinary Office Lady Asai Riko's Broken Heart"

After witnessing her boyfriend cheat on her, even promising to marry him, Riko is wandering the streets in shock when she is approached by a pair of suspicious twins.
She is taken to the salon "Salon de Cthulhu," which uses a unique method to provide the ultimate detox for both body and mind...
Though she is unsure what to do if it turns out to be a suspicious store, during a counseling session with Kyogoku, the president, she feels strangely light-headed and ends up telling him everything, including that her boyfriend had cheated on her, and that they had made a promise to marry each other.
"It's okay now... We'll take care of all your painful feelings, and the mess that's about to overflow."
Unable to resist, Riko is placed on the treatment table and the twins play with her body.
"What is this... I can't put any strength into it..."
Unable to resist, Riko begins to feel something, and a monster covered in tentacles appears in front of her...
"There's no need to be scared... Because you're about to experience... blasphemous pleasure..."