Bakemonogatari, Part 1 (Light Novel)

There’s a girl at their school who is always ill. She routinely arrives late, leaves early, or doesn’t show up at all, and skips gym as a matter of course. She’s pretty, and the boys take to whispering that she’s a cloistered princess. As the self-described worst loser in her class soon finds out, they just don’t know what a monster she is.