Why does the Rayearth anime end differently from the manga?
The first season of the 1994 anime, twenty episodes, stays close to the manga’s first arc, adding subplots and one original retainer, Inouva, but keeping the destination: Emeraude, who loved Zagato and so could no longer pray only for Cephiro, imprisoned herself and summoned the Magic Knights to kill her, since no one of Cephiro could. Both versions arrive at that execution, and at the girls carrying it home.
The departure comes in season two. CLAMP’s Part II is a compact invasion story. Television needed twenty-nine episodes, so the anime built its own engine of conflict: two antagonists who do not exist in the manga, born from the first season’s trauma. The destination survives almost intact. The road does not.