Asahina had a premonition that he would never be able to escape Shun Aonuma for the rest of his life.
Because he is madly in love with him.
Even if he is about to become a karma demon;
Even if he likes this childhood sweetheart girl;
Even if the final outcome is still forgotten.
There is an original female protagonist who appears, basically equivalent to a passerby, and does not interfere with the emotions of the protagonists.
I haven't read the whole story since I was new, and I don't have a clear world view, so the background setting in the article contains a lot of original factors and adapted plots, so just treat it as an imaginary fan _(:зゝ∠)_