"Mm. It was a big surprise! But she seems happy and in control of it."

Whatever's going on here. Definitely isn't this Kyoko, unless this is the biggest prank ever...but she doubts it. Mami decides to resume that search later...and answer the more pressing question, gesturing for her favorite partner to come out and say hi.

A small green, white, and pink hedgehog pops up from Mami's hood, chattering a hello.

"Oh, I have Rosetta to thank for that! She's my precious partner, a gift from my friend Jonouchi-san. Her purity magic can clear my gem, and it also seems to make plants grow big."