Comic book series : Under Ninja

After infiltrating Kodan High, Kuro overpowers the enemy gal corps, and then goes head-to-head with their boss. Meanwhile, Katoh notices something unnatural about Kuro's apartment and its residents, and becomes increasingly suspicious of the organization. Amidst all the various speculations, Kuro is asked to help plan a fight with another school, which the delinquents long to be a part of. Meanwhile, a new incident occurs in Nerima in which a ninja is targeted by an invisible man!