[Hunter X Hunter] My Head Isn't Made of Dough

Zhan Qian, a fine young man from another world, couldn't control himself and turned into an eight-year-old kid.

Eight-year-old Chrollo: "Kid, I think you're acting pretty damn cool."

Zhan Qian: "??? Who are you calling a kid? Call me Master!"

Twenty-six-year-old Zhan Qian from the apocalypse transmigrates to the Hunter world. Because energy isn't conserved, he spends most of his time in the body of an eight-year-old kid.

A story about one brat leading a bunch of other brats as they struggle to open a restaurant in Meteor City.

Chrollo x Zhan Qian, one-on-one.