recommendation

PSYCHOLOGICAL
nonbl; little to no romance
- http://www.mangago.me/read-manga/an_uncomfortable_truth/
- http://www.mangago.me/read-manga/save_me/
- http://www.mangago.me/read-manga/bastard_hwang_youngchan/
- http://www.mangago.me/read-manga/suicide_boy/?av=1

hetero
- http://www.mangago.me/read-manga/head_over_heels/

http://www.mangago.me/read-manga/stalker_x_stalker/
http://www.mangago.me/read-manga/my_deepest_secret/

Yandere straight couples. But if you can you might wanna read these on line webtoon instead coz its free and you can support the author

http://www.mangago.me/read-manga/broken_melody/

Good portion has yandere vibes

http://www.mangago.me/read-manga/secret_alliance/
https://www.webtoons.com/en/drama/its-mine/list?title_no=2010
http://www.mangago.me/read-manga/aishi_no_yue_charlotte/