Zakuro takes Ichigo to the rehearsal of a jewelry company premiere where she befriends a clumsy crew member named Tsukiko. Tsukiko really wants Zakuro to wear a rainbow stone necklace for the show, but both the stage manager and Zakuro reject it for being too modest. Ryou, Keiichiro, and the aliens all believe the stone is made from mew aqua. During the show, Kish tries to steal the necklace. The Mew Mews fight for the stone but are having a hard time with the chimera anima Kish is using until they are helped by the Blue Knight. After the monster is defeated, they discover the stone is not mew aqua. Deciding it is not an ordinary stone, Zakuro arranges for Tsukiko herself to appear in the show wearing a simple white dress and the necklace, proving Tsukiko's claim that the stone can make any girl shine.
Pam porta Mew Berry a una presentazione di gioielli di un'azienda molto importante. Una ragazza dello staff vorrebbe che Pam indossasse una collana con una pietra arcobaleno. Secondo il manager però non è adatta alla'occasione. Intanto tutti credono che la pietra della collana contenga l'acqua mew. Dopo uno scontro con gli alieni, si scopre che la pietra non contiene la preziosa sostanza in questione. Lo show riprende e stavolta Pam decide di accettare la richiesta di indossare la collana.
ざくろに、風邪で倒れた付き人の代役をまかされたいちごは、お供で行ったジュエリーショーで、月子という女性と出会う。レインボーストーンという名の新作ジュエリーのアイディアを持っている月子。だが、月子の上司は、仕事で失敗続きの月子を、まともにとりあってはくれない。あきらめかける月子だったが、ざくろの言葉に勇気づけられ、会場へ戻ってくる。一方、レインボーストーンがミュウアクアかもしれないと考えたキッシュたちが、ショーに現れ大暴れ。だがミュウミュウは、突然現れた蒼の騎士の助けを借りてキッシュたちを撃退した。そして無事再開されたショーには、なんと月子がレインボーストーンをつけて登場した！月子の前向きな気持ちを映したレインボーストーンは美しい輝きを放つのだった。
