Unemployed Yukito meets Kuniko, who has also had a broken heart, and they quickly begin a relationship and live together at Kuniko's house. At the same time, Yukito's ex-girlfriend, Sarina, breaks up with her husband and is kicked out of her house, coming from the countryside to rely on Yukito. Yukito allows Sarina to stay overnight while Kuniko is away on the night shift, but Sarina, who is lonely sleeping alone, persuades him and they end up having a relationship. He begins a life of secret rendezvous with Sarina and making love with Kuniko during the day, but...