Sacrificing Myself To The Demon Queen

A boy who is about to go out of his mind. Endless suffocation and pain are all that is left for him in his world. Will the demon he believes so much in granting him what he desperately wishes for? or will it be suffering for the rest of his life for wanting to defy the natural order of the world. Suffering and pain will surely cease to exist when his body becomes cold, but will that really be the end of his sufferings?