Recess warriors

"When imaginations go wild in the schoolyard, anything can happen. Normal kids become world-saving heroes, girls become power-hungry pirates, and zombies take over the school after being infected by the dreaded epidemic--cooties! It's up to Scrap, his partner Yoshi (don't you dare call her a sidekick!), and Clinton, the baddest cowboy in the, um, badlands, to stop recess from collapsing into total apocalyptic chaos"--Amazon.com.