This hurts to say but I only see 2 endings for this and they're both sad: 1. "Hikaru" dies...

This hurts to say but I only see 2 endings for this and they're both sad:
1. "Hikaru" dies/returns to the other side and loses himself again and Yoshiki grieves for him as should've been from the start, moral of the story is that he directly contradicts himself from ch1 by learning to let go of Hikaru and "Hikaru" and that's his character arc. The typical "good" ending for a story like this.
2. They both die/go to the other side together, this mostly comes from that one unexplained page in ch32.1 of a TV report talking about how they were both found dead and the fact Yoshiki has stated multiple times he's not leaving "Hikaru" behind, although the lesson of the story might just be to learn to let go, I wouldn't put it past the author to follow through with it and the ending would probably be a lot more surreal and symbolic than a real telling of what happened to them afterwards/they'd show everyone else grieving for them instead.