Does anyone knows about a manga that has interesting plot...Well ansatsu kyoushitsu has 5 chapters left...I want to fin another one...THANKS

Tokyo ghoul :re
It's a good manga with and interesting plot, plot twists and cliffhangers each chapter.

If you like Slice of Life, how about "A Method to Make the World Gentle" or "Tomo-Chan Wa Onnanoko!"?
If you like action, then how about Panlong Manhua(I know not manga, but this is in color, so that is a decent tradeoff).
You probably have heard about Doulou Dalu if you have read a decent amount of manga, but it really is that good and has a good sequal(Doulou Dalu li).
Karate Shoukoushi Kohinata Minoru is a good Sports Manga in my opinion, fairly realistic except for the Sociology.
Mx0 is pretty good and interesting, it is a good action manga about somebody without powers in a school of people with powers, then someone with the power to eradicate the effects of other powers near his body, but then he has to hide it.
Tales of Demons and Gods has an interesting plot and is one of my favorites, but it seems to have gone onto Hiatus(Stopped being translated or written for a set amount of time, from a hour to forever).
Finally, Gamble Fish is entertaining, educational, interesting, and riveting, but extremely ecchi.