There Is Nothing That Money Can't Buy - "Okane de kaenai mono-wa arimasen" (お金でかえないものはありません)
Oga is shocked to discover that the seal on his arm is growing bigger the more Baby Be'el grows attached to him, which in turn happens with the more evil deeds that he does, so Oga decides to turn his back on his wicked ways to keep the seal down. However, a rich punk named Himekawa doesn't believe that Oga has changed, so he has his gang kidnap Furuichi and then Hildegarde to lure Oga into the school. Oga finally decides to save his friends by fighting Himekawa. Despite Himekawa's dirty tricks, Oga manages to send him flying, thanks in part to the newly learned Zebub Spell.