Planet Princess Grand Prix

The Planet Princess Grand Prix (プラネットプリンセスグランプリ) is an annual event where the top four idols in the Aikatsu Ranking compete against each other, with the winner earning the title of true top idol.

Due to the difficulty of making it into the top four altogether, even getting to participate is considered an accomplishment. To increase their rank prior to the Grand Prix, idols can also enter major competitions where winning earns more points than in regular battle stages.

Top Ten Final Battle
The Top Ten Final Battle (トップテンファイナルバトル) is the last major competition before the Grand Prix, where the top ten on the Ranking are given one more chance to secure their place. It consists of five battle stages, with the top ten split into opposing pairs.

Regardless of who wins each match, the four idols with the most points overall move on to participate in the Grand Prix. There is also bonus points awarded to the idol who manages to fire up the crowd the most.

Grand Prix
The actual Grand Prix is set up as a single elimination tournament. The winner of each semifinal matchup moves on to the finals, where the victor is officially crowned the top idol of Aikatsu Planet.

History
The year prior to the series, Hana and Q-pit were two of the four who participated in the Grand Prix. Hana won, establishing her as the top idol of Aikatsu Planet. Ruli and Beat also attempted to participate but fell short of the ranking.

In the current year, the Top Ten Final Battle ended with Rose, Q-pit, and Hana in the top three, confirming their participation in the Grand Prix. Beat and Ruli were tied for 4th and had to engage in a tiebreaker, which was ultimately won by Ruli.

After respectively defeating Ruli and Q-pit, Hana and Rose faced off in the finals, with Hana as the victor.

Participants

 * Rose
 * Q-pit
 * Hana
 * Ruli

Result
Ruli Hana Rose Q-pit Semifinals Hana Rose Final Hana  Winner

Trivia

 * Although not explicitly stated, Ann was also active as an idol when the previous Grand Prix was held, but likely was unable to make the cutoff given her newly debuted status.
 * While Hana has won the Grand Prix two years in a row, each time was under a different user, the first being Meisa Hinata and the second, Mao Otoha.