whats the anime of this anime?

its about a man that gets his mind/soul put into a boys body, but he still has his GUN only he can shoot. Hes on a quest to find his body, he has an older dude helping him and a creature whose the 2nd last of its kind. the creature was married to the last female of its kind who is with these 2 girls. the boy keeps dreaming of a woman. and I think its based on a game

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