Did you dislike my comments for no reason? Project Aego has one of the best intros to a VN that I've seen and is set in a dark, cruel scenario. It's about two brothers with superpoweres who's father was in some shady business. One of them wants to find out what happend, the other one decides to do research as detective. https://twitter.com/projectaego?lang=de
https://new.lewd.ninja/game/12688-project-aego-v0210-flickerburst-adult-games
The gameplay is long? I don't think so.