|Director||Yousei A. Sina|
|Air date||July 21st, 2017|
|Opening Theme||Starlet - A New Beginning|
|Ending Theme||Hibike to hibiki ※ Asahi to asami|
|Predecessor||Ainochi: Idol Stars!|
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A new idol years has started at the Three Hearts Academy and Mirai and her friends are excited for their new adventures. Since the girls have formed their groups, they have grown closer together and were able to face new challenges. It seemed to be a normal idol life, until suddenly a new Idol System started changing everything the girls knew up until now. With Once Upon An Idol, the stars of the universe will shine even brighter than before! And with that, maybe the Top Idol of the universe will return to stage...?!
Three Hearts Academy Students
- Taiko Mirai (褪紅 みらい?) - A second year idol student who attends the Three Hearts Academy. She is part of the popular idol unit Amanogawa ☆ along with her fellow idol friend Ishimura Kibou. She is a cute-typed idol, who tries to get at the top of the Idol Galaxy.
- Ishimura Kibou (石村 きぼう?) - A second year idol student who attends the Three Hearts Academy. She is part of the popular idol unit Amanogawa ☆ along with her fellow idol friend Taiko Mirai. She is a pop-typed idol who wants to be the first modeling and dancing idol.
- Igarashi Masae (五十嵐 雅恵?) - A second year idol student who attends the Three Hearts Academy. She is part of the popular idol unit Center 3 along with her idol friends Hisakawa Hoshi and Nishimoto Aya. She is a cool-typed idol who wants to become a true idol designer one day.
- Hisakawa Hoshi (久川 星?) - A second year idol student who attends the Three Hearts Academy. She is part of the popular idol unit Center 3 along with her idol friends Igarashi Masae and Nishimoto Aya. She is a sexy-typed idol who dreams of becoming the best actress at the whole school.
- Akita Kazue (秋田 カズエ?) - Kazue is a sexy typed idol who attends Three Hearts Academy, being a student of the Style & Melody class. Kazue used to be part of Center 3 and is now the leader of the idol unit Tori Color.
- Imamura Futaba (今村 ふたば?) - Futaba is a cute typed idol who attends Three Hearts Academy, being a student of the Hibike & Perform class. Futaba used to be part of Center 3 and is now the part of the idol unit Tori Color.
- Hojo Miki (北条 三姫?) - Miki is a cool typed idol who attends Three Hearts Academy, being a student of the All about Acting Class class. Miki used to be part of Center 3 and is now the part of the idol unit Tori Color.
Nakazato First Academy
- Sawai Yusuke (澤井 友介?) -Yusuke is a second year student of Nakazato First Academy. He is currently trying to support sick childern and adults to grow over their sickness. He's a style typed idol, who uses the brand MAX Volume.
- Okumura Seiji (奥村 せいじ?) - Seiji is a second year student of Nakazato First Acaemy. He, along with Yusuke and Takao, are in the idol unit ℋ³, whose goal it is to support poor people around the world. He's a charm typed idol, who uses the brand Charming Prince.
- Hagiwara Takao (萩原 タカオ?) - Takao is a third year student of Nakazato First Academy. Being a famous actor, Takao supports his unit through his most popular role, Detective Okamoto. He's a energetic typed idol, who uses the brand Paradise.
- Shiomiya Ryuichi (塩宮 龍一?) - The top idol of this idol universe. Ryuichi has currently to deal with his school works but has sworn to return on stage one day. He has stated that he loves the concept behind H³. He is a sexy typed idol, who uses Imperial Orient.
- Wazahara Kiyomi (技原 清見?) - Kiyomi is a cool, independent idol who currently attends the Morning Star Elite Academy, learning how to be a real author. Kiyomi is known as the midnight idol "Mirage-sama", who likes to spread a scary and ghostly atmosphere.
- Fukumi Umiko (福見 うみこ?) - The headmistress of the Three Hearts Academy.
- Nakazato Isao (中里 いさお?) - The headmaster of the Nakazato First Academy.
- Sweet Kiss (スイートキッス?) - A new brand that was introduced in the series and replaces My Little Heart as Mirai's favorite brand. The brand appeal is called Fairy Flight.
- Fifty Storms (フィフティー・ストームス?) - A junior brand on which Masae and her class mates work. It is Masae's new primary brand and replaces Spice Chord. The brand appeal is called Visual Five.
- Decoring World (デコリングワールド?) - A new brand that is cased on the Japanese Street Fashion Decora and replaces Shiny Smile as Kibou's primary brand. The brand appeal is called Dreamy Flower.
- Endless Summer (永久の夏?) - A new brand that was introduced in spring 2017 and replaces Romance Kiss as Hoshi's primary brand. The brand appeal is called Citrus Bubble.
- MAX Volume (MAXボリューム?) - MAX Volume, also called MAX Vol, is a style typed brand of the series. MAX Volume is created by Sawai Yataro. The brand appeal is called 100% Music.
- Charming Prince (チャーミング王子?) - Charming Prince is a charm typed brand of the Ainochi! idol series. Charming Prince is the male counterpart to My Little Heart. The brand appeal is called Royal Wave.
- Paradise (パラダイス?) - Paradise is an energetic typed brand of Ainochi! idol series. Paradise is the main brand used by Hagiwara Takao. The brand appeal is called World Jump.
- Imperial Orient (インペリアル・オリエント?) - Imperial Orient is a sexy typed brand of Ainochi! idol series. Imperial Orient is the male counterpart to Romance Kiss. The brand appeal is called Lion Dance.
- Main article: Ainochi!/Music
Please refer to the main page Ainochi!/Merchandise for more information.
- Main article: Ainochi!/Specials
Once Upon An Idol
- Main article: Once Upon An Idol
- Main article: Dramas in Ainochi!
- Main article: Ainochi!/Special Appeals
- Three Hearts Academy (三心臓 学園?) - is an all-female idol school. There are four different idol classes and the current headmistress is Fukumi Umiko.
- Nakazato First Academy (中里第一アカデミー?) - is the only boys idol school in Japan. It is a partner school to Three Hearts Academy and holds a rivalry between it.
- Four Summer Garden (四夏ガーデン?) - The biggest park in Town, connecting the Three Hearts Academy and the Nakazato First Academy.
- Morning Star Elite Academy (明星エリート学園?) - A quite popular private school for artists who don't dream to be idols. The Morning Star Elite Academy is known to have many different classes, just like the Three Hearts Academy.
- Dragon Palace (竜の宮?) - Dragon Palace is the official name of the place Shiomiya Ryuichi lives after leaving Nakazato First Academy to become an independant idol. The Dragon Palace is also the HQ of Lion Age.