The main characters, Himari Aozora and Mitsuki Hoshikawa, enter Paradise Private Academy. 
Himari, who aspires for AIPRI, dreams of making 10,000 friends!
But for the shy and anxious Himari, it might be a bit difficult... 
 
Himari unexpectedly makes her AIPRI debut!? 
 
She has a "secret" she can't even tell her best friend, Mitsuki!
But it seems that Mitsuki has a "secret" of her own... 
 
Secret-bearers Himari and Mitsuki's AIPRI begins!! 
 
(Source: Official Website, translated)

[Official Website](https://machi.co/) | [Official Blog](https://ameblo.jp/miumachi10/) | [Profile (Horipro)](http://www.horipro-international.com/artist/machico) | [Twitter](https://twitter.com/MachicoOfficial) | [Instagram](https://www.instagram.com/machico_3s25/) | [Wiki (en)](https://en.wikipedia.org/wiki/Machico_&#40;singer&#41;) | [Wiki (jp)](https://ja.wikipedia.org/wiki/Machico)

Machiko Saitou, better known by her stage name Machico, is a Japanese singer and voice actress from Hiroshima Prefecture who is currently affiliated with the Horipro talent agency. 

After participating in an audition organized by Horipro, she made her music debut in 2012, singing a theme song for a PC game. She was cast as the character Tsubasa Ibuki in the mobile game The Idolmaster: Million Live! in 2013. Apart from voice acting, she has performed theme songs for KonoSuba and Age 12. Machico released two albums between 2014 and 2015, and opened her official fanclub in late 2016.

(Source: Wikipedia)

It's a new semester! Himari and Mitsuki have become second-year students of Paradise Private Academy! Their school lives become more and more lively with the introduction of new underclassmen full of individuality and personality.
 
In the AiPri-Verse, new AiPri are appearing one after another! Everyone tries their hand at a brand new, never-before-seen Buzzrium Change! In the midst of all this, the mysterious Princess Ring Clover and her butler, Shimitsuu, are holding an Aipri contest. They say the winner will become an admired "Eternal Aipri." Himari and Mitsuki are all ready and full of fighting spirit! But it appears Princess Ring holds a very large secret...
 
As their friends increase, so does the mysteries of the ring. The Ring arc finally begins!
 
(Source: Offiical Website, translated)

A manga released alongside the Himitsu no AiPri anime series, summarizing the key points of each episode in only four panels.

Hiiro Aozora