Tristar (トライスター Toraisutā?) is an idol unit which started off with Mizuki Kanzaki, Kaede Ichinose, and Ran Shibuki from Starlight Academy. In the corresponding anime series, Ran leaves Tristar in Episode 37 to join Soleil and Yurika is chosen as the final member in Episode 38 to take Ran's place.
In Episode 33, Mizuki announced to the Starlight Academy community about an audition to form a unit with her, named Tristar. To join this unit, the students were given a week to train theirselves for the audition, which Hikari Minowa ignores for her title of "The Underground Sun". The challenges for the audition were divided into many intense obstable courses, including:
- The Wall to Being a Top Idol
- The Balance Beam and Volleyball Attacks
- Rodeo Live
- Battle Against the Giant Fan
- Live Audition
From the Live Audition, Mizuki decided to hold a Final Audition, with the remaining participants which included:
Right after the Final Audition audition was announced, Kaede Ichinose, an American "Super Idol", skydives to meet Mizuki and enters the Final Audition via Mizuki's approval.
The Final Audition was held the next day after the Elimination Audition, with Kaede entered as another one of Starlight Academy's official students. In this audition, Kaede was chosen to be the second member, leaving Ichigo, Aoi, and Ran to proceed toward the Real Final Audition. The remaining contestants (Ichika, Sango, and Nino) were eliminated from the contest.
The last audition was set for Ichigo, Aoi, and Ran (who were sent to a secret mansion inside Starlight Academy's area). During a day camp here, their Aikatsu phones were held by Johnny Bepp and they stayed in different rooms. Orihime Mitsuishi also gives them the 2013 Summer Collection cards for the auditions. The next day, they were interviewed by Mizuki for a live broadcast. During said interview, Ran was hinted to be the last member and in the live audition. After everything was said and done, Mizuki formally chooses Ran as the last member for Tristar.
Rivalry with Soleil
As some days past, Ran starts to leave her dorm for Tristar's business; however, slowly, she started to miss Ichigo and Aoi, and the growing depression had caused her to begin messing up during training and rehearsals. Having realized this, Mizuki allowed Ran to leave Tristar, right on the night before Tristar's live in Ōsaka. On the day Tristar had their live in Ōsaka, Ran arrived moments after Ichigo and Aoi announced the name of their unit, Soleil, confirming she left Tristar. Mizuki announces the same thing at Tristar's event.
After some days that Ran had left Tristar to join Soleil, Mizuki happened to come across Yurika at a building nearby taking a break, witnessing how she kept character despite nobody else being around. It was this that made her decide to have Yurika join Tristar and when Yurika is announced to be Ran's replacement, Mizuki also announces a special live of Tristar and Soleil.
Orihime announced that Tristar, Soleil, and later Powapowa-Puririn that they'll merged into STAR☆ANIS for a summer tour. Tristar returned to doing activities after the tour, but disbanded after Mizuki left Starlight Academy. Kaede and Yurika vowed not to perform together again, but later became unit partners once more after the announcement of the Partners Cup.