S1·E53 So Giaku, The Water Dragon of Rage!
Aired April 18, 2004
Synopsis
A mamodo who's in love with Zatch comes to Kiyo's school in search of him. When she comes face to face with Zatch, he can't remember her. She swears that she will never forgive him and will burn his book. At Kiyo's school, she challenges Kiyo and Zatch to a battle.