Episode 21 - Our Planet☆

Our Planet☆ (ふたりのプラネット☆) is the twenty first episode of the Aikatsu Planet! TV series. It aired on May 30th, 2021.

Summary
The Planet Princess Grand Prix has finally begun! Ayumi and Meisa are to face off already in the semifinals. Ann invites them to a party in a show of support, but actually has uneasy thoughts. The emperor of stoicism Ayumi and the natural genius Meisa. When the emotions of polar opposite, yet one and only rivals run their highest, even the Dressia will experience a change!

Plot
Taking a break from running, Ayumi watches a video of herself from when she had just made her debut as Q-pit. Past Ayumi announces that her goal is to reach new heights in Aikatsu Planet, with current Ayumi musing that she's still far from doing so. She then receives a call from Ann asking her to return to the agency, where Meisa is also there.

Excitement runs high as the semifinals for the Planet Princess Grand Prix finally begin, with Hana and Ruli up first. In the waiting room, the pair engage in a staring contest to relieve their tension before taking the stage. They perform a duet of "Magical Door", with Hana as the victor and the one to advance to the finals.

Now Hana's opponent must be decided between Rose and Q-pit, but both are still at the agency as Meisa has lost her AiPla Phone. Ayumi soon realizes that hers is gone as well and asks Ann to call it, but the other claims that her phone is out of battery. Meisa apologizes to Ann, who has seemingly wasted her efforts making food for them in a show of support.

Ann states that it's fine if they are unable to appear in the Grand Prix, as everyone already recognizes them as top idols. Ayumi reminds Ann that the reason she's been working so hard was in anticipation of standing on stage with Meisa again. She also brings up that there's something she's decided to do after they performed together at the Grand Prix.

When Ayumi refrains from explaining, Meisa attempts to tickle the information out of her to no avail. They acknowledge that despite their different personalities, it was only because they had each other that they were able to make it thus far. They express their gratitude towards each other, and unbeknownst to them, their respective Swings start to shine.

Inspired by Ayumi, Meisa decides that she'll also do something new after the Grand Prix. She looks over at the table of food Ann had prepared and notices a pot labeled sautéed vegetables, suggesting that she'll try overcoming her dislike of them. After taking the lid off, Meisa instead finds it empty with only her AiPla Phone inside.

Ayumi opens another pot labeled with food she dislikes and also happens to find her phone, leading Ann to snatch the phones out of their hands and runs off. Making a plan to intercept her, Ayumi chases Ann onto the balcony, where a cornered Ann throws the phones over the railing. However, Meisa had made her way outside and catches them just in time.

Ayumi and Meisa then sit Ann down and question her intentions. Ann reveals that she overheard Ayumi talking to their manager about how she would stop doing Aikatsu after the Grand Prix. To that end, Ann attempted to hide their AiPla Phones and cancel their battle stage in an effort to make Ayumi reconsider her decision.

Ayumi assures Ann that what she heard was just a misunderstanding, and that she would never quit being an idol when there's still so much for both of them to accomplish. Suddenly, Ayumi and Meisa are whisked away in a flash of bright light coming from their Swings, leaving behind a confused Ann.

Q-pit and Rose find themselves in Aikatsu Planet with their respective key Dressia. Love Sagittarius and Luxury Rose explain that because their idols continuously push each other to advance to new heights, they are now able to "Dressiup" and achieve their ultimate form. A determined Rose and Q-pit then make their way to the concert hall.

Ann arrives just as they're about to enter the stage. Q-pit summons the newly evolved Sagittarius Milky Way alongside Noble Leo, while Rose does the same with Rose Yggdrasil and Luxe Sunflower. They perform a duet of "Soulmate", with Rose as the victor. Everyone then gathers at Million to reflect upon the semifinalists' incredible performances.

Ann follows up on her supposed misunderstanding with Ayumi, who reveals that she was planning to put a hold on her solo activities and instead form a unit with Ann. Ann happily accepts the offer, affectionately calling her new partner "Ayumi-chan". On the other hand, Meisa and Mao address each other as the Grand Prix finalists.

Characters

 * Mao Otoha/Hana
 * Ruli Tamaki/Ruli
 * Kyōko Umekōji/Beat
 * Shiori Motoya/Shiori
 * Ayumi Tsukishiro/Q-pit
 * Ann Kurimu/Ann
 * Meisa Hinata/Rose
 * Sala
 * Izumi Watanuki
 * Keito Kirihata
 * Shō Kurosaki
 * Ryōka Dōba
 * Love Sagittarius/Sagittarius Milky Way
 * Noble Leo
 * Luxury Rose/Rose Yggdrasil
 * Luxe Sunflower

Trivia

 * Episode Title Reference: "Our Love Land" (ふたりの愛ランド) by Yūko Ishikawa and Chage.
 * This episode premiered on the birthday of Yui Ishikawa.
 * Sagittarius Milky Way and Rose Yggdrasil make their debut in this episode.
 * This marks the first occurrence of a Dressiup.
 * Although Sala and Izumi appear in the episode, they have no dialogue and as such are left uncredited in the ending sequence.