0verflow special data book is a booklet bundled with the 0verflow Premium Box. It contains previous illustrations from Large PonPon, PureMail and 0verflow Pleasure Box; relationship charts of the characters from Large PonPon and PureMail, walkthroughs for Large PonPon, PureMail and PureMail After; a map of Oohara City, the 0verflow Character Adultery Chart, a family tree of the characters from 0verflow's games and the Kagura Chronology a chronology of Kagura's life between Snow Radish Vacation!! and Summer Radish Vacation!!.
- There are many errors through the book especially in the 0verflow Character Adultery Chart.