
Sumire Hikami  is one of the primary protagonists for Data Carddass Aikatsu!'s 2015 Series and the third and fourth seasons of the anime. She is a cool-type idol and her primary brand is LoLi GoThiC.

Sumire is a very beautiful girl with a calm disposition and is kind, soft-spoken, and polite. She has always preferred being by herself, but this began to change when Akari became her roommate. She loves LoLi GoThiC and fortune-telling and is commonly seen carrying tarot cards with her.

(Source: Aikatsu Wikia)

The third season of Aikatsu! In place of Ichigo Hoshimiya who was the protagonist in the first two seasons (she will still be in the story as a supporting character), the new season will feature her underclass girl Akari Ozora with her classmates. 
 
(Source: Anime News Network)

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The fourth season of Aikatsu! continues on from season 3 with an introduction a brand-new idol unit from Hokkaido.

Aiming to be a Top Idol is what Ichigo Hoshimiya does, and a big chance for it comes!
Somehow, Ichigo will lead a special live! 
 
The title of the live Ichigo will be "Great Ichigo Starmiya Festival" and the venue is the place where Ichigo watched for the first time the top idol "Mizuki Kanzaki"s live, "Star Rise Stadium". 
If this live is a big success, Ichigo might genuinely become a Top Idol! 
 
What kind of stage will this movie end up with? 
Songs, drama, laughs, and tears! The biggest and hottest stage of Aikatsu! finally begins!

An Aikatsu! All-Star awards ceremony takes place which features songs and stages featured throughout the anime series.

An event turned into a movie, with our director being Ichigo Hoshimiya and our main heroine being the idol who just became the Starlight Queen, Akari Oozora!
A slapstick story about finding that one Aikatsu! Card.
The final stage of the 25 idols.

Raki Kiseki is a second-year middle school student who transfers to Star Harmony Academy to become an idol. However, when she uses an Aikatsu Pass she received from her big sister (an Aikatsu engineer), something mysterious happens. Lots of doors appeared before her, and when she opens them, she meets Aikatsu idols she never knew before, such as Yume Nijino. Raki vows to design her own premium dress and perform in it on stage. (Source: Anime News Network)

Yume Nijino is in a pinch!?
A luxury school idol cruise liner called Venus Ark has suddenly appeared!
And the perfect idol who leads this ship is "Elza Forte"!!
While traveling around the world, she gathered the most excellent idols and brands she could find.
And now she has set her eyes on her next target, Yume Nijino of Four Star Academy. 

(Source: Aikatsu Stars! Wiki)

The main leads Ichigo Hoshimiya and Akari Oozora in their debut outfits as the Cosmos duo (from the television series finale). The film's story introduction reveals that the first live Cosmos concert was a great success. Later, Ichigo faces her graduation from Starlight Academy in half a year — but even after graduation, the life of an idol continues.

Compilation film of Aikatsu!'s 3rd Season's "Aikatsu Restaurant" episode (ep. 140), followed by the "Unit Cup" arc (eps. 136-138), also featuring new segments with commentary from Akari, Madoka, Juri and Sumire. A part of the 10th anniversary celebrations of the Akari Generation.
 
After an announcement that a "Unit Cup" will be held at Starlight Academy's middle school, the eight performing two-member units are as motivated as they can be. This time, the event's broadcast will also feature a special corner where the idols report on each other's true faces behind the scenes. Is it time for the idols to clash with each other more passionately than ever?! The curtain rises on the Unit Cup right here and now!
 
(Source: Official Website, translated)