
Alexander Yamato is a Prism Show destroyer and street tyrant. He's a first-year in high school.

(Source: ANN, kinpri.com)

After appearing in the Prism King Cup representing Edel Rose, and getting a glimpse of what it was like to a be a future Prism Star, Ichijo Shin entered Kakyoin Academy’s High School division in spring and became a first-year high school student. Koji, Hiro, and Kazuki from Over The Rainbow left Edel Rose and established a new agency. 
Meanwhile, after having the title of Prism King stolen by Hiro, the leader of Schwarz Rose, Norizuki Jin, proposes PRISM.1, which would decide a new king other than Prism King. He then announces that Schwarz Rose and Edel Rose will be competing with each other. 
(Source: Crunchyroll)

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He's part of a music unit called AMADEUS under the name "Jack Westwood".

On September 5, 2022, it was announced that he married the filmmaker and director Misato Kato.  

__Non-anime roles:__
- Dr. Ratio - Honkai: Star Rail (VG)

Skills & Abilities: Plays the piano

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Shin Ichijou and seven new students join the Edel Rose training school to follow their dreams of idol singer stardom. They hope to become the next Prism Stars and appear in future Prism Shows. However, Edel Rose is threatened by an evil plot hatched by Jin Norizuki from rival school Schwarz Rose. Over The Rainbow goes on indefinite hiatus to save Edel Rose and the three performers go their separate ways. In order to return a huge debt, Kōji goes to Hollywood to produce film music. Kazuki goes on a quest to rediscover his own origins as a street-style performer. Hiro delves into special training to improve himself. In separate locations, the members come to face themselves as Prism Stars. 
(Source: Anime News Network, edited)

The unit Over The Rainbow succeeds in its debut. Aiming to become like the boy band, more students enroll in Edel Rose. Hiro and the others begin practice for the Prism King Cup, an event that is held once every four years. However, a rival called "Schwarz Rose" appears... Who will become the Prism King, the one who can make girls' hearts throb the most!? 
 
(Source: Anime News Network)

New KING OF PRISM film reconstructing the events of the Prism Show competition, the PRISM.1, shown during KING OF PRISM -Shiny Seven Stars- with added scenes.

A collection of lives from the King of Prism franchise. The best ten live scenes were chosen by the fans out of twenty-eight scenes.
 
Note: Also includes a new scene from King of Prism: Shiny Seven Stars.

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)