Mitsuki is a cool and serious first-year junior high school student at Paradise Private Academy, and is Himari's childhood friend and dorm mate. She is skilled at playing the piano and baking sweets, and terrified of ghosts.

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)

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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)

The main characters Himari Aozora and Mitsuki Hoshikawa have entered Private Paradise Academy. Himari's dream is to make 10,000 friends! Himari unexpectedly makes her AiPri debut!? She's discovered a "secret" that she can't even tell her best friend, Mitsuki! However, it seems that Mitsuki also has some kind of "secret''...
 
(Source: Official Website, translated)

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