Kitty Chaos
Love and Chased: Luna's Worst Day Ever
Koisarete owarete! Runa no saiaku no hi
"Usagi and friends meet a girl who they believe holds the final Rainbow Crystal. Zoisite also pursues her. But when neither Usagi's Moon Stick nor Zoisite's Dark Crystal reacts to the girl, they realize it's her pet cat that possesses the Rainbow Crystal!" (source)