Responses
Some of these aren't completed, but I think they fit:
http://www.mangago.zone/read-manga/azumanga_daioh/
http://www.mangago.zone/read-manga/tasogare_memorandum/
http://www.mangago.zone/read-manga/handa_kun/
http://www.mangago.zone/read-manga/machida_kun_no_sekai/
http://www.mangago.zone/read-manga/secret_x_siblings/
http://www.mangago.zone/read-manga/cool_doji_danshi/
http://www.mangago.zone/read-manga/see_you_at_the_food_court_tomorrow/
Thank you!!!!
A light hearted manga that's short (complete if possible) I prefer it if it takes place at school, no romance or BL and GL at all.