IV: Louis × Shin × Unknown
The Prism World creates the Rinne/Shine program to guide Prism Stars of their respective gender in spreading the Prism Sparkle. However, believing male Prism Stars to be selfish, Shine defies orders and becomes a Prism Star himself under the name Wataru Hibiki. Rinne seals Shine, but her copies become erratic without him, forcing the Prism World to create a new version of her to handle male Prism Stars: the Louis program. Shine is sealed inside Shin's body when he watches a meteor shower in his childhood. During the events of King of Prism by Pretty Rhythm and King of Prism: Pride the Hero, Louis reawakens Shine inside of Shin and defects from the Prism World.
In present time, at the Prism 1, Louis performs "I Know Shangri-La" with a routine based on their date, having realized that he is in love Shin instead of Shine. Shine awakens during Louis' Prism Jump, and when Louis tries to subdue him, Shine mentions that if he dies, Shin will lose his ability to perform Prism Jumps and his memories beginning from when Shine was first awakened in him. Shine defeats Louis, causing him to fall unconscious and earn 4950 karats.
Shin falls unconscious when he is about to perform and reawakens with no memory of his Prism Show. While replaying footage, he discovers Shine took control of his body to perform "Platonic Sword" with a Prism Axel, a move using several simultaneous Prism Jumps. He scored 0 karats due to terrifying the audience, while The Shuffle's group performance scores 13450 karats, making Schwarz Rose the winner by default. Hijiri encourages the Edel Rose freshmen to perform their group song anyway to entertain the audience.
Shin apologizes to the audience for frightening them, and the Edel Rose freshmen perform "Nanairo Chikai (Brilliant Oath)" as Edel Rose 7 Stars. During their Prism Show, the Prism World cuts off the Prism Sparkle, rendering them unable to continue, but with the audience's support, a new Prism Goddess resembling Rinne is established and the Prism Sparkle returns. Shine is sealed, and the Edel Rose 7 Stars earn 20000 karats for their performance. Despite their loss, Jin has a change of heart and does not destroy Edel Rose, while the Edel Rose 7 Stars move to Over the Rainbow's agency and debut under the name Septentrion.
