Before the start of the game, they had first revived a mamodo with Animuto a Bell like mamodo.
After that Biburio battled against Souma, who uses his Barudesu spell on them, after that Biburio gained a new spell Rigaro Animuku, that "transformed" them into manga books. Soon Nasuka "turned" Evil.
Nasuka appeared in the middle of the game, catching Kiyo's book, soon she was defeated by Zatch.
Biburio in the elapse of the game was using the Animuto spell to revive mamodo to fight Zatch.
In the game's climax, Zatch and Tia go to a library where they find Biburio and he uses Birude Animuga on them, however, Souma in Kokomelo's form appears and burns Biburio's book.