Bl

Black mirror. Absolutely psychotic but it’s works Cus they’re both psychos. Idk if I’d call it romantic tho
https://www.mangago.me/read-manga/black_mirror/

Curious Recipe - Not very unhinged, but kinda stalkery and cute
https://www.mangago.me/read-manga/curious_recipe/

Glen (글렌) - don't remember if he would do anything for him, but stalking
https://www.mangago.me/read-manga/glen/

Murderer Llewellyn's enchanting dinner invitation - def would do anything
https://www.mangago.me/read-manga/murderer_llewellyn_s_enchanting_dinner_invitation/

Waterside Night - no stalking, but would do anything, obsessed and possessive
https://www.mangago.me/read-manga/night_by_the_sea/

The edge of ambiguity - possessive, stalkerish
https://www.mangago.me/read-manga/the_edge_of_ambiguity/