Yukine, an office lady working for a black company, has a daily routine of stopping by the park alone after work and drinking a can of beer to relieve stress. One day, she meets a woman named Ena, who wears tracksuits and glasses. The two get excited as they are the same age, and then it suddenly starts raining... Yukine is invited to Ena's room. There, she finds herself in Ena's 4.5 tatami apartment, so small that there is no room to move... The environment she grew up in...