Zatch Bell!

Coldhearted Foes (1x42)

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Zatch has a fever but decides to accompany Kiyo to school anyways. Kiyo and Zatch get into an argument and Zatch collapses from the fever. After placing Zatch in the care of the school nurse, Kiyo finds Apollo at school. Apollo tells Kiyo that after Rops' book was burned, he became the president of his father's company. He then reveals that the Mamodo who burnt his was someone that resembles Zatch. He reveals that in Holland, the Zatch look-alike ad his partner Dufort mercilessly defeated them in battle. Apollo reveals that the Zatch look-alike's name is Zeno. Kiyo promises that he will defeat them for what they done to Rops. Zatch wakes up from a nightmare about Zeno and visits Kiyo who tells Zatch to become a kind king.