ShoSakyu follows a lonely, impulsive guy (that's you) who finds a summoning book in a park one night after work.
Upon using the book (without reading it) you're shocked to find our main girl of the story Nono, who is a succubus, knocking on your door to fulfill the contract you've unknowingly signed. Despite her determination however, it becomes painfully clear that Nono doesn't seem too cut out for the job. After an awkward first meeting, Nono ends up moving into the guest room, and you must try to resume your life as normal while taking care of her.