Kenka no Gokui 6(2010)

After fighting every single day, Haru and Shingo have grown absurdly strong. Yet stronger enemies keep coming—this time from Byakuya Academy, whose elite unit “Brother Scorpion” launches a full-scale assault. Overwhelmed by numbers, Kiwakō faces its greatest crisis. Momo entrusts everything to Haru, marking a generational shift as the ultimate school war begins. In the chaos of battle, Haru is forced to discover what strength truly means.