Everyone from my part-time job decided to have a house party. Even though we were talking about a drinking party, we were cultured bookstore employees who would just have a few drinks and go home before the last train. That's how it used to be... This time, Umino-san, a new part-time employee, joined the party for the first time. She's a quiet, earnest girl with glasses who's highly rated by her coworkers. Perhaps because she was nervous, she drank heavily and ended up completely drunk...