Momoko, who dreams of becoming an illustrator, finds employment in an ultra fast-paced office that specializes in designing pachinko parlors!! With the office running a yazuka-like business and employing a designer, who has a habit of suddenly stripping in the middle of the night, Momoko believes that the company employees are a bit... no, definitely eccentric!! She continues pulling all-nighters, unable even to return home... And in the midst of cigarette-filled fumes, where women's authority takes a step back, she asks herself, "What am I doing here?"
Caught off guard, Tamako, who neither has confidence, sex appeal, or romantic experiences, finds herself working for an office full of suspicious people that specializes in designing pachinko parlors. And thus, her days of agony begin to unfold.

