He still wants to revive his dead sister!? Isnt that pretty fucking impossible because of the amount of time that passed? If he truly wanted to reunite with her, then he should have stayed dead and meet her in the afterlife or whatever. Where do souls go after death in this story? If they disappear after a while, he wont be able to revive his sister. If they reincarnate after a while, he definitely wont be able to revive his sister. If theres an afterlife, I'd say it's better he just meets her there.