When he was a kid, Yukiteru lit candles and stared at the candlelights, but the candles fell down. A fire broke out and the whole house burned into ashes. Since that time, he has lived at the home of childhood friend Yuno. Yukiteru and Yuno are a couple known to everybody. Rena is a new transfer student in Yuno's class. She becomes interested in Yukiteru and one day they have an intimate encounter. This changes Yukiteru and his relationship with Yuno.

Uwakoi is a romantic comedy movie that revolves around the tangled relationships and love experiences of high school students. It explores the complex dynamics of teenage romance, friendship, and betrayal. The story follows a group of students as they navigate through their romantic entanglements, creating a rollercoaster of emotions and dramatic situations.