Yu-Gi-Oh! GX Vol. 6 (manga)

The Power of Kaiser!

Chazz Princeton, the rising star of Duel Academy, faces the champion Ryo Kaiser in a fiery duel atop an active volcano! While his classmates' eyes are riveted on the big match, Jaden fights alone against Reggie Mackenzie, a duelist possessed by an evil entity. If Jaden wins, he might save the soul of his teacher, Miss Hibiki. If Jaden loses, Reggie will steal his precious "Winged Kuriboh" card...and Jaden's soul in the bargain!