Can someone give me mangas, manhwas or manhuas where monsters suddenly starts to appear on...

Apocalypse No Toride

http://www.mangago.me/read-manga/afterschool_war_activities/
http://www.mangago.me/read-manga/rendezvous/
http://www.mangago.me/read-manga/unknown_code/?Zxd0
http://www.mangago.me/read-manga/sweet_home/
http://www.mangago.me/read-manga/gantz/
http://www.mangago.me/read-manga/neon_genesis_evangelion/
http://www.mangago.me/read-manga/shokuryou_jinrui/
http://www.mangago.me/read-manga/hakaijuu/
http://www.mangago.me/read-manga/tokyo_dragon/
http://www.mangago.me/read-manga/bakuen/

Thanks ^^