WIND BREAKER manga volume 6 features story and art by Satoru Nii.

Now that he's won the respect of his classmates, Sakura has been promoted to class leader. Unfortunately, there's little time to celebrate, as new trouble strikes. A comrade's childhood friend is in danger. To save him, Sakura snd the other first years will have to charge into KEEL's home turf. Do the heroic delinquents stand a chance fighting behind enemy lines?