New Nobunaga Chronicle: High School is a Battlefield

A history buff mad scientist cloned warlords of Japanese civil war period out of his curiosity and released them to the world. And 15 years later... The cloned warlords grew up as highschoolers gathered in Ginnan High School. To be the ruler of the school, they were expected to be fighting each other with bloodshed... However. Without being noticed, the student who is very unlike the warlord known in the history has been keeping the peace and order of the school.