Kenji has a strong inclination towards dating girls, however, finding a stable relationship is a challenge. One rainy day, Kenji is caught in despair, standing in the rain, until his friend Kei spots him and offers him shelter under an umbrella. Kei takes Kenji to his home, where they dry off and end up sleeping on the same futon.
Despite his brother's opinion, Kei doesn't find it strange for two high school students to share a bed. As they continue to sleep together, their romantic feelings for each other begin to develop, making Kei's futon a lot warmer than usual.
