Hibiki is a part of Callings and Rizumu's obvious love interest. He is very nice to everyone and likes to tease Rizumu.
~!He is revealed to be Kanon's(a rival for Rizumu especially) older brother.!~

Prism Stars are performers on the new popular ice show, Prism Show. They are superidols whose techniques, singing and fashion sense are a cut above all others. Aira and Rizumu are two Prism Stars whose goal is to become the best, the Prism Queen. However, the road to success is bumpy. 
(Source: AniDB)

[Agency Profile](http://zynchro.jp/talent/kenn.html)

Three years after the events of "Pretty Rhythm: Aurora Dream," Aira, Mion and Rizumu have grown up and tutor a new group of aspiring idols: Karin, Reina, Mia and Ayami, who form the Prizmmy&#9734;. Teenage girls from Korea, named Somin, Shiyoon, Haein, Chaekyung and Jae Eun (who are the PURETTY), appear as a rival group. 

PriPara Movie: Minna Atsumare! Prism☆Tours is the film based on and starring the characters from PriPara. The film first began showing in theaters across Japan from March 7th, 2015. The plot focuses on Laala Manaka finding out about Saints' top idol journey, and aside from the PriPara performances, the movie also features the journey of characters across all the Pretty Rhythm series.

At some point in the movie, the characters are given a choice of four doors to go through. At this point, the movie diverges into one of 4 routes depending on what the audience chooses. Each route recaps different aspects of the previous Pretty Rhythm series, mainly reintroducing the different characters and their performances. However, Laala and friends only get a chance to enter one door at a time, meaning the film must be watched four times to view each door choice.
 
(Sources: PriPara Wikia and Wikipedia)

This time King of Prism is "Prism☆Tours"! Shin Ichijou and the other six members of SePTENTRION will travel across time and worlds in a time machine to the origins of Prism Shows. 
 
It will cross the boundaries of the series and intertwine with the worlds of the "Pretty Rhythm" series, "PriPara" series , "Kiratto Pri☆Chan", and "Waccha PriMagi!" to deliver a sparkling Prism☆Tours.
 
Fated boy meets boy, our worlds are now connected by the prism's sparkle!
 
(Source: Official Website, translated)

Rizumu is a young teenager girl who dreams to become a Prism Star like her late mother, a famous ice-skater, and to participate in the Prism Dance Skate, the most famous ice-skating show.