So the first one I will recommend is just a lot of mystery of the world they live in, but the MC in BIG BRAIN so he knows EVERYTHING lol and the second one is the mystery of the male MC thinks and what he's going to do. XD Hope they take to your liking!
- http://www.mangago.zone/read-manga/omniscient_reader_s_viewpoint/
- http://www.mangago.zone/read-manga/u_kill_i_cook/
http://www.mangago.zone/read-manga/mystery_to_iunakare/
http://www.mangago.zone/read-manga/monster/
http://www.mangago.zone/read-manga/yuureitou/
http://www.mangago.zone/read-manga/liar_game/
http://www.mangago.zone/read-manga/ouroboros/
http://www.mangago.zone/read-manga/sprite/
http://www.mangago.zone/read-manga/mushishi/
http://www.mangago.zone/read-manga/shin_ai_naru_boku_e_satsui_wo_komete/
http://www.mangago.zone/read-manga/op_yoake_itaru_no_iro_no_nai_hibi/
http://www.mangago.zone/read-manga/xxxholic/
http://www.mangago.zone/read-manga/ayeshah_s_secret/
http://www.mangago.zone/read-manga/when_night_falls/
http://www.mangago.zone/read-manga/killing_morph/
http://www.mangago.zone/read-manga/yuukoku_no_moriarty/
http://www.mangago.zone/read-manga/liber/
http://www.mangago.zone/read-manga/boy_s_abyss/
http://www.mangago.zone/read-manga/shinrei_tantei_yakumo/
Suggest any manga that has great mystery