From Renta!:

"I'm not in love with you anymore." When Mamoru was 12 years old, Kanato, the childhood friend he thought of as a brother, told Mamoru that he loved him. But Mamoru replied, "Two guys can't be like that," and rejected him. After that, they went their separate ways. Mamoru wanted to apologize and return things to they way they were before... Now 15, Mamoru moves to Tokyo to pursue Kanato and they meet again at the same school, in the same dorm room... They feel such warmth when they sleep next to each other, Kanato's hand stroking Mamoru's head... Nothing's changed. But they can't turn back time.