 If you liked
Magic Knight Rayearth
|
 ...then you might like
Ginga Ojousama Densetsu Yuna: Kanashimi no Siren
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Mahou Shoujo Mecha anime are a rare find and those two anime are examples of such.
"Ginga Ojousama Densetsu Yuna" is a more classical Mahou Shoujo with strong Mecha elements.
"Magic Knight Rayearth" is an isekai anime set in a fantasy world that slowly transforms into Mecha.