Reccs?

MIND BREAKER / ORCHESTRATED DEPENDENCY
- http://www.mangago.zone/read-manga/imitation_mate/
- http://www.mangago.zone/read-manga/gintama_dj_mienai_kusari/
- http://www.mangago.zone/read-manga/hikizuru_oto/
- http://www.mangago.zone/read-manga/akuma_chan_wa_momoiro/
- http://www.mangago.zone/read-manga/seishun_kinema/
- http://www.mangago.zone/read-manga/lovely_play/
- http://www.mangago.zone/read-manga/miteranneeyo/
- http://www.mangago.zone/read-manga/seito_no_shuchou_kyoushi_no_honbun/
- http://www.mangago.zone/read-manga/10/

YANDERE/POSSESSIVE
- http://www.mangago.zone/read-manga/kusatta_rasen/
- http://www.mangago.zone/read-manga/hikizuru_oto/
- http://www.mangago.zone/read-manga/imitation_mate/
- http://www.mangago.zone/read-manga/mujintou_ni_motte_iku_nara/
- http://www.mangago.zone/read-manga/stalker_s_game/
- http://www.mangago.zone/read-manga/deichuu_no_hasu/
- http://www.mangago.zone/read-manga/obey_me/
- http://www.mangago.zone/read-manga/ibitsu_no_kakera/
- http://www.mangago.zone/read-manga/yami_bl/
- Ch5: http://www.mangago.zone/read-manga/kanchigai_lokidoki_koi/
- http://www.mangago.zone/read-manga/individual_diet_preference/
- http://www.mangago.zone/read-manga/poison_and_sex/

i tagged these mangas as 'psychological' and 'twisted' which may or may not have a yandere character, but the overall theme and ambiance are similar

gosan no heart

Candyman, right?

Thanks a lot for this ♡＼(￣▽￣)／♡

Yep, looking for something like Candyman

hahah i was recommending candy man, but it seems like you've read it, so these two are the ones that I remember as well (+ if you haven't read them):
http://www.mangago.zone/read-manga/hosik_s_story/
http://www.mangago.zone/read-manga/sin_of_heart/