Eiko is a part-time worker at a certain company. One day, she is invited to have a drink after work by a full-time employee named Kyoko. She is taken to a certain izakaya run by Kyoko's mother, Izumi... A few days later, Eiko visits Izumi's bar again, and in the relaxed atmosphere, she drinks alcohol, which she doesn't usually drink. As expected, she gets drunk. Eiko doesn't know at the time... that Izumi and Kyoko have cleverly set up a trap for her...