Everyone arrives in the Sorbette Kingdom and prepare for the Jeweling Festival. The stage is set but what's missing is the audience. It seems that the cold weather in the Kingdom has intensified making it extremely cold, even indoors. With the citizens of Sorbett unwilling to leave their homes, the idols must figure a way of warming everyone up.
Alicia feels reluctant to reform I Believe with Hibiki, feeling she is far behind Hibiki in her Aikatsu having spent the past five years on hiatus. As Alicia struggles to catch up, Hibiki offers to assist her.
The idols are given a well-deserved break from work and spend the day at the beach.
Wakaba comes to realise what she has been missing as an idol. Having seen how much she has grown, Mirai decides it's time for Wakaba to stand on her own and make her debut. But as the day she has been waiting for approaches, Wakaba seems troubled and reluctant make her debut.
Star Harmony Academy is holding an open day event for people to come and see the school and how the idols train. Mirai offers to have Wakaba lend a hand as she feels her protege is still lacking something essential for becoming an idol. Wakaba manages to help out fine until an old friend of hers appears at the school, causing Wakaba to become distressed.
Aine and Mio ask Hibiki when she and Alicia will start doing Aikatsu together as I Believe. However, Hibiki reveals she hasn't had a chance to speak with Alicia since returning to Japan. Aine has an idea and tells Hibiki to ask Alicia on a Friends date.
As HoneyCat's world tour comes to an end, Maika and Ema discuss what they should do next.
Alicia wonders how to best get back into Aikatsu and asks Pure Palette if she can follow them round for a day. Alicia also realises she has nowhere to stay yet so Karen volunteers to have Alicia stay in her mansion. Between Pure Palette's Friend Energy and Karen's kindness Alicia begins to understand what she needs to do to move forward.
After being asked by Hibiki to accompany her to the Sorbette Kingdom, Aine and Mio begin preparations to leave Japan. This proves more problematic than normal when Aine reveals she has never left Japan before, nor does she have a passport.
Aine is determined to keep up with Mio and earn her own jeweling dress. Having found an unrefined jewel, Aine gets the chance to make it shine when Mirai asks her if her protégé Wakaba can shadow her for the day. Unfortunately Aine lets thing go to her head and nearly loses the chance of earning her own jeweling dress.
Hibiki wants to get to know the idols of Star Harmony Academy so her producers create a TV show for her to interview them. However Hibiki decides to make things more interesting by changing the interviews to a prank show.
Everyone is taken by surprise at Hibiki and her Jeweling Dress. In an effort to unlock the dress' secrets, Mio and the other girls ask Hibiki to show them Space Aikatsu.
One year after becoming Diamond Friends, Aine and Mio prepare to enter the Star Harmony Academy High School. But along with the responsibility of teaching the next generation of idols about Aikatsu, Aine and Mio begin a new journey in Aikatsu when they receive a distress call from a strange new idol named Hibiki Tenshou from space.