Reborn!, Vol. 5 (v. 5)

Tsuna becomes the protector of a master statistician and his book of statistics, which supposedly holds the key to Mafia control of the world! Naturally, other gangs would like to have this book, but that isn't Tsuna's biggest challenge. He also gets embroiled in the snowball fight to end all snowball fights, and finds himself on a zoo date with Kyoko!