Responses
For horror bl you should try https://www.mangago.me/read-manga/tales_of_seol_gongchan/
It's so good but so underated
https://www.mangago.me/read-manga/the_11th_school_trip/ similarly stuck in a timeloop
https://www.mangago.me/read-manga/shadow_under_the_moon/ not really isekai but mc dies and is 'reborn'
https://www.mangago.me/read-manga/madk/ gore, mc makes a pact w a demon and is reborn in hell
Any horror themed bl/straight isekai? I just finished dreadful night and how to survive as a maid in horror game, now I'm hooked.