Ninjas and knock outs!

"Tao is a student at venerable master Kerozen's martial arts school. With his friends Rakai and Lee-Tou and his not-girlfriend Katimini, he tries to follow the teachings of the masters at the school--or, more often, finds a way around the masters' advice. Tao does not lack for ambition, but he has a tendency to get himself into trouble"-- Tao dreams of becoming a martial arts master, but his wandering mind always gets him in trouble, especially when he starts having lovey-dovey thoughts about his friend Kat. Book #2