I mean the purpose of this manga is not to entertain or to make you laugh, the purpose is to make you feel uneasy, disgusted, anxious, and all around like a piece of shit, and it does that pretty well. Don't read this if you're not looking for that.
@me474 age of consent is 13 in Japan so if consensual is totally legal, probably unthinkable if you live in one of those countries where the age of consent is 18.
I live in Italy where it's 14 so it's not that far off...