Aine Yūki is good at making friends, and is enrolled in Star Harmony Academy's general education track. She befriends Mio Minato, the school's top idol, and becomes an idol herself.

The world's number one assassin has been reincarnated as the eldest son of a family of aristocrat assassins. In exchange for being reincarnated in another world, a goddess has imposed upon him one condition. "Kill the Hero who is prophesied to destroy the world." This was to be the mission in his new life. The synergistic effect of the vast knowledge and experience he gained that made all manner of assassinations possible in the modern world, and the secret techniques and magic of the fantasy world's most powerful family of assassins turn him into the greatest assassin of all time.

She's small. She's sweet. She's…capable of obliterating a tank in under three seconds?! Built by Enji and Suzume, two underappreciated genius scientists, Alma is the ultimate self-learning AI. There’s just one thing: She thinks they’re her mom and dad! Now as unexpected co-parents, the duo must hide their budding romantic feelings while taking on the messiest experiment of all: family life!

Ichitaro, the frail yet sharp-minded master of Nagasakiya, rarely leaves his estate—but he’s far from alone. Gifted with the ability to see spirits, he’s protected by ghostly companions like Hakutaku and Inugami. One night, he slips out and witnesses a brutal murder. Soon after, Edo is plagued by a series of eerie murders. As fear grips the city, Ichitaro and his spirits must uncover the culprit.

Long ago, the most ancient of divine dragons was slain by a human. The mighty dragon accepted its death when suddenly, it was reborn as Dolan, a man who lives in a quiet village. While spending another peaceful day toiling in the fields, he meets Celina, a half-human, half-snake creature looking for a partner. The unlikely duo become friends, but challenges lie ahead that threaten their new bond.

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 (Aikatsu Stars!). Raki vows to design her own premium dress and perform in it on stage.

Its story is set in Aikatsu Planet, a world where everyone can become cute idols using an avatar. While spending school life, the main characters are aiming to become top idols. Everyday parts such as the main character's school life will be filmed in live-action, and the Aikatsu Planet! world will be drawn in anime and 3DCG (like the previous series). The live-action part's cast members will form a unit "STARRY PLANET*" and perform as idols at events and on YouTube. A new Data Carddass game linked to the TV series, "Data Carddass Aikatsu Planet!" is also scheduled to begin its service this winter.

Hiwa Natsunagi is a high school student living in Iwaki City, Fukushima Prefecture. Worried about what to do with her life after graduation, she spots a poster for Spa Resort Hawaiians the “Hawaii of Tohoku” the place where her sister Mari used to work and applies to their new dancer (hula girl) campaign on a whim. Despite her lack of experience, Hiwa is accepted for the job, and starts on the path towards becoming a Hula Girl with her classmates, Kanna, Ranko, 'ohana and Shion. However, unable to keep in step with one another due to their differing personalities, their first stage ends in disaster. Called the “most pitiful rookies ever” the girls are disheartened, but they learn to share the good and bad...and strengthen their bond despite the occasional fumble. With their hearts and minds firmly set, the girls grace the stage once more.