Can anyone tell me what happened at the end I'm still a bout confused

They had to exorcise Akira. He was instinctively trying to kill Haruto. At the last minute, Akira realized that he couldn't be with Haruto and he couldn't come back to life, either. Akira decided to pass on peacefully and asked Haruto to sing to him one last time. Akira moved on to the next life and Haruto started singing publicly.