Akatsuki!! Otokojuku: Seinen yo, Taishi wo Idake

Set over 10 years after the conclusion of Sakigake!! Otokojuku, this manga focuses on Shishimaru Tsurugi, son of Momotaro Tsurugi from the previous series, and a new generation of Otokojuku students, while still featuring much of the same school staff. Like Sakigake!!, the plot focuses on the hellish training of Otokojuku, fighting enemies, and the births of new friendships.

(Source: Wikipedia)