there a anime i been looking for the whole día

don't remember the name but it about a girl a magical girl she has a sidekick who helps her out and he came from another world i think and he can turn in to a animal his pelaje, piel color is purple and the animal looks cute.they are looking for seeds i think.the girl met him in school he was in the girls locker room.if i remember he estola someones underware.yeah and she gets magical later in the ep.also i it a old anime not old but old