A Mysterious Job Called Oda Nobunaga, Vol. 2 (light novel)

Arsrod manages to seize the Kanryuu Prefecture in an battle that defies all common sense, making him the leader of one of the largest forces in the country. And he's all but invincible, now that he's joined forces with Kerala, who works as "Akechi Mitsuhide." With no one to keep him in check, he's ready to launch his next plan: A scheme to invade the imperial capital with Hasse, the orphaned child of the previous king! But no one knows that Arsrod himself is burdened by a certain secret...