if you want to understand the reference to "eternal children" go to youtube and search for "academy of ideas archetype of the man-child"
gives credence to someone who said this manga was based on "peter pan" lol well that guy whoever he is just got a shit ton more credit because apparently peter pan was based on the archetype of the "man-child" as well.
oh....sorry, to make that make sense. the archetype of the man child has another name for it "Peur Aternus" Latin for "eternal child" lol driving my points home has always been a thing for me lol.