Himari Aozora enters the private Paradise Academy with her best friend Mitsuki Hoshikawa. Her dream is to make 10,000 friends! Himari longs to be an idol princess — an Aipri who sings and dances like Mi-chan, but it might be a little difficult for the shy and anxious Himari. However, she manages to make it through the entrance ceremony thanks to Mitsuki's secret good luck charm. On her way back to the dormitory, exhausted, Himari discovers a mysterious door in the student council room. What awaits her is the Aipri Verse, a place where Aipri sing and dance!

Himari has successfully made her debut as an Aipri. However, she realizes that she broke her promise to Mitsuki that they would "debut together" when she was little. On the other hand, Mitsuki, who debuted as the Aipri Mi-chan, is also heartbroken that she broke her promise to Himari. Himari wants to sincerely apologize to Mitsuki, but is warned by the student council that produces Himari that it is a "secret" that she must not tell anyone. Mitsuki also couldn't bring herself to tell Himari. The relationship between the two, who have a "secret," gradually becomes strained...

The super popular duos Ruby=Lazuli and AISMIRIN announce that they will hold the 1st AiPri Grand Prix, a competition where the idols compete in singing and dancing. Himari and Mitsuki decide to compete as solo artists. Sakura trains hard with the aim of winning the competition alongside Tamaki. However, Tamaki realizes that Sakura's true purpose is not to win the Grand Prix, but something else...

All students at Paradise School are banned from using AiPri by Principal Victoria. Himari, who broadcast on AiPri after lights-out time, was feeling guilty about this. The student council president, Sakura, goes to Victoria to try to revoke the ban. Victoria says she will allow you to use AiPri if she can show you how wonderful AiPri is. Then, Sakura tells Himari and Mitsuki to form a duo and perform an incredible live show. Will the two be able to perform a live that convinces Victoria?

An adorable drawing of Himari and Mitsuki was very popular on SNS “AiPrigram”. In the class, everyone is excited about the artist “Yuko Sai”, who made the drawing. Meanwhile, Himari and her classmate Hanazono Yuko are chosen to be part of the class newspaper committee. Himari wants to become friends with Hanazono, but she is very shy and it is not easy to get close to her. At one point, Himari ends up accidentally seeing a drawing made by Hanazono.

On her channel, Chii searches for a ghost rumored to appear in the world of AiPri, the “AiPriVerse”. Mitsuki passes out after watching the broadcast because she is very afraid of ghosts. Himari decides to go to AiPriVerse to capture the ghost. However, she ends up revealing to Mamiya Chii, a classmate passing by, that she is an AiPri. Himari also discovers that her classmate is actually Chii from AiPri. Himari and Chii decide to form the AiPri Detective Team to investigate the ghost's true identity.

Mitsuki has been feeling a little lonely lately seeing Himari spending so much time with Suzukaze Tsumugi. Meanwhile, the student council investigates Tsumugi, who has launched a new system called “Bazzlume Change”, which is activated when the audience's enthusiasm reaches its limit. To test her abilities, Sakura asks Mitsuki to face Tsumugi in a Duel Test. However, Mitsuki is worried that if she loses, Himari will be taken from her, so she announces that she wants to stop participating in the Duel Test.

The Nyan Nyan Festival is an event where AiPri gather dressed in cat clothes. On the day of the event, Mii-chan's channel receives a comment from a cat owner asking for help finding her lost cat. Himari and Mitsuki start looking for the kitten. During the search, they find Yuuma acting suspiciously. Yuuma was secretly taking care of a cat that had entered the school, but when he realized that this cat is the same one mentioned on Mii-chan's channel...

Final exams are coming up, Himari and Mitsuki are dedicating themselves to their studies. Meanwhile, in AiPri Verse, many of the Aimu, including MC Aimu, are talking to each other. Himari's Aimu returns from maintenance and reports what has happened to Himari so far: her debut, her secret with Mitsuki, the meeting with Tsumugi, the competition against the super duo Ruby=Lazuli, the ban on AiPri by director Victoria , the duo of Himari and Mitsuki…Aimu and the others remember the different memories of AiPri that Himari experienced.

AiPri stars Ruby=Lazuli will perform wearing the Rose Grand Prix Coord, which they won at the 1st AiPri Grand Prix. Himari and Mitsuki are very excited about this, but Tamaki Nikaido, one of the members of Ruby=Lazuli, is worried. On the day of the show, Sakura and Tamaki excitedly go to AiPri to perform, but they are unable to go on stage and the show is cancelled. The two are told by the Rose Grand Prix Coord: “You can’t dress me like you are now.”

Himari hasn't been seen at AiPri for over 10 days, she lost all confidence in herself after seeing Ruby=Lazuli's performance. During this time, Himari feels as if Mugi-chan, the Pri-Usa, is talking to her. Thus, Himari enters the dream world and meets Tsumugi. Tsumugi tells Himari that she forgot how to smile. Himari then realizes that she can't remember how she used to smile. When Mitsuki finds out, she asks Himari's brother Hinata and her own brother Yakumo for advice.

AiPri stars Ruby=Lazuli announce that the “2nd AiPri Grand Prix” will be held. Himari Aozora and Mitsuki Hoshikawa decide to participate as a pair and promise to win, to achieve this they begin to train hard. However, one day, Himari ends up sleeping too much. Mitsuki, who had planned the special training, is angry because Himari ruined everything. In the end, Mitsuki gets angry with Himari because she doesn't apologize and doesn't think she did anything wrong. Himari responds by saying, “You don’t need to be so mad!” and, before the Grand Prix, the two end up fighting.

During the 2nd AiPri Grand Prix, Mitsuki tells Himari that their duo is breaking up. When Tsumugi finds out that the two had a fight, she goes to talk to Mitsuki to try to reconcile them. Mitsuki says, “There are times when Himari is so selfish that I can't deal with her,” but decides to face her properly and apologize. Tsumugi goes to see Himari to tell her about Mitsuki's feelings. Tsumugi intends to reconcile their friendship, but ends up saying that Mitsuki said: “Himari is selfish”. As a result, the relationship between Himari and Mitsuki worsens even further. Will the two be able to reconcile before the live performance?

Lately, the AISMIRIN duo of Airi Mitsuba and Rinrin Shinomiya haven't been doing any shows. As their popularity is declining, the two decide that their next performance will be their “last show”. Although the group still has the PriFriends' attention, Airi wants to retire the unit while it is still popular. When Sakura Ichijouji and Tamaki Nikaidou discover this, they tease the two by saying, “It's a shame. We’ve never seen you guys do a Bazzlume Change.” Feeling frustrated, Airi and Rinrin begin training, but are unable to perform the Buzzlume Change. They realize that if it continues like this, the chance of them saying goodbye successfully is practically nil.

On the last day of the first semester, Himari is called by the student council and is told that “it is time to graduate from student council production.” However, this depends on her passing the final exam. Himari is allowed to take the test with Mitsuki and Tsumugi, but to pass, they need to give an even more incredible performance than the one at the 2nd AiPri Grand Prix. The three think about what type of presentation to do and decide on the name of the group.

Summer vacation is finally here. In her dream, Aozora Himari encounters the Mermaid Grand Prix outfit that she received as the grand prize outfit at the 2nd Aipri Grand Prix. She is then given the challenge of finding the mysterious treasure, "Mermaid Stardust," that lies dormant in the sea if she wants to wear it. After that, Himari goes on a family trip to a villa near the sea. It turns out to be the villa of Mitsuki Hoshikawa's grandparents, and Mitsuki is also there. While enjoying their summer fun, Himari finds out that Mitsuki had the same dream, so she invites Tsumugi Suzukaze and the three of them go looking for the "Mermaid Stardust" that lies dormant in the sea of ​​Aipriverse. What is the true identity of the mysterious treasure?

Himari is having a great time at her villa during summer vacation. However, it seems that everyone, including her family and Mitsuki, are keeping some kind of "secret" from her. Himari also wants to tell her family her "secret" - that she is Himari from Ai-Pri. Meanwhile, when Himari sees Mitsuki talking to her grandmother about Ai-Pri, she feels envious. She also wants to tell her family, but for some reason she is interrupted and cannot. So Himari decides to reveal her feelings at an Ai-Pri Live.=

Himari and Mitsuki are still enjoying their summer vacation. But when they wake up, they are shocked to find that they, along with their classmate Mamiya Chii, are on a deserted island! There are huge dinosaur-like footprints on the ground. Are these the footprints of a giant creature that was supposed to be extinct...? Will the three be able to escape the island safely? Meanwhile, Mitsuba Airi of the student council is planning to hold an Airi-Pri music festival to make the last memories of summer vacation.