At first, Takayuki Narumi becomes friends with Mitsuki Hayase simply because Mitsuki’s best friend, Haruka Suzumiya, has a crush on him. Over time, Takayuki, his close friend Shinji Taira, and Mitsuki grow inseparable. One day, Haruka confesses her love to Takayuki, and, not wanting to hurt her feelings, he agrees to date her. Their relationship becomes intimate while Takayuki and Mitsuki start to realize their own feelings for each other. But when tragedy strikes, the lives of the four friends are forever altered.