Question

http://www.mangago.zone/read-manga/itsuwaribito_utsuho/
^Kinda predictable in the beginning, simple shounen and the comedy is gold. Towards the end it gets pretty dark though. A nice time killer read.

http://www.mangago.zone/read-manga/gokusen/
^If you don't mind Student(M) x Teacher(F) but the romance is hardly touched on, a slow burn romance and mainly focuses on MC teacher setting her delinquent students on the right path.

I've got a couple of assorted recommendations:
http://www.mangago.zone/home/mangalist/477692/

And ones with beautiful and plot:
http://www.mangago.zone/home/mangalist/453703/

If you want to laugh:
http://www.mangago.zone/home/mangalist/453610/

Try Sunadokei http://www.mangago.zone/read-manga/sand_chronicles/