○○ se yo!! Sengoku Gakuen Seitokai  

Maru Maru se yo!! Sengoku Gakuen Seitokai, ○○せよ!! 戦国学園生徒会

The manga series Sengoku Gakuen takes place in a school that's modeled after famous shoguns from Japanese history. Initially, it was like any other school with teachers in charge. However, Nobunaga, the student president, overthrew them and made himself the leader of the students. After graduating, he left Hideyoshi as his successor to lead Sengoku Gakuen. The story begins at this point, where Ishida Mitsunari, a hardworking boy with conservative views, is facing off against Tokugawa Ieyasu, who has many followers and is the temporary president of the school. Other notable characters include Ootani Yoshitsugu, loyal to Mitsunari, and Nobunaga's younger sister, Oichi. The series concludes with one of these characters being elected as the student body president and taking control of the school.