6th-grader Chase Cooper shares his experiences starting at a different school where he only knows his cousin Zoe, and he is recruited into a group of school-aged ninjas.

The name's Chase Cooper, and this is my tenth diary as a 6th grade ninja. If I had a penny for every time trouble came knocking at my door ... I'd have ten pennies. A few days have passed since the green ninja clan appeared, but that's more than enough time for them to give me a headache. It doesn't help that my attention is stretched between a crazy robotics competition, an annoying pirate poser, and the ex-leader of the red ninja clan. Somehow Wyatt...

There's a big talent show at 6th-grader Chase Cooper's school. Everything is going well until someone sets a wild animal loose and trashed the stage during rehearsal. Now Chase is racing against the clock as he deals with a some new ninjas, an ugly moose costume and a missing bird.

The name's Chase Cooper, and this is my eighth diary as a 6th grade ninja. After having the worst week of my life, you'd think I'd try to relax and maybe stay out of the limelight, right? Nope! Zoe has me in front of the entire school playing in the Spirit Week Competition that she's set up as the new president of Buchanan. The problem is that Wyatt's playing too, and if he wins, his red ninjas will become stronger than ever before. I've been recruited...

Buchanan School is holding an election for new class president, and Chase Cooper's sister, Zoe, is running. Meanwhile, Chase refuses to join a Scavenger club, who then responds by trying to ruin Chase with every opportunity. Everyone seems to hate him now, and a reporter tries to expose his secret ninja clan to the school. Worst. Week. Ever.

"Chase Cooper here, and I'm back with my eleventh diary as a 6th grade ninja! CRAZIEST. WEEK. EVER. It's the week of the supermoon, and the Astronomy Club is hosting an overnight on Thursday. Sounds like an awesome time, except for the fact that the red and green ninjas, AKA the holiday ninjas, have secretly planned a finishing move for Wyatt that would destroy him forever. As if that weren't enough, some kid name Chris Moss, AKA Christmas, makes...