Wait which chapter thdy talkrd about the first human? :0
I think maybe during balam Sensei's lesson?— I don't remember clearly but when I was watching when the anime aired I remember balam sensei saying Abt how the last human appeared like so and so years ago but I'm not sure if that meant the first human
I don't remember the chapter but it's when Iruma meets Azazel Henri; Amelie's father.
Read chapter 38
I thank thee
I somehow feel like there is a connection between this first human who entered the demon world and was sent back to the human world, the missing Demon King Delkira and Iruma-kun.