It is said that when the Kyuubi attacked Konoha, the Fourth Hokage used the forbidden technique to seal away the corpses, and finally sacrificed himself, his wife and their newborn child... It should be this.
After the Fourth Hokage used the technique to seal away the ghosts, when he and his wife were about to die, their newborn son opened his eyes and said, "You are such an interesting man, I'll keep you alive." Then the Fourth Hokage survived, his wife died, and a happy life began.
The protagonist is a combination of Ichihara Ikuko from "XXXHOLIC" and the shopkeeper from "Pawn Shop No. 8". (Purely the author's imagination)
Any similarity is purely accidental and this article will be discounted.