Nobunaga-Sensei

(from ebookjapan):

The time is 1582 in the Sengoku period! Oda Nobunaga, driven to the brink of ruin at Honoji Temple, was transported with a bolt of lightning to modern Japan. Then, for some reason, he decided to become a "teacher".

What are the lessons that are taught on the overwhelming scale of the Great Unifier? Hideki Owada, the mangaka of "Mudazumo Mukashi Reform", unleashes a comedy of educational destruction for the whole world!