Mirai Momoyama, Emo Moegi, and Rinka Aoba are 2nd year students at Kirarigaoka Middle School in Kirajuku, and together they form an idol group called 'Miracle☆Kiratts'! The popularity of their streaming programs has skyrocketed! One day, a mysterious Pri☆Chan idol named 'Dia' appears, and everyone is given a Jewel Pact. Along with that, she announces the opening of the 'Jewel Auditions', an event where idols with a jewel-like shine are chosen to become 'Jewel Idols'. Only those who can pass the audition with a sparkling heart can make their 'Kiratto Jewel' shine, allowing them to receive their 'Jewel Coord'. And out of all of them, only the best 'Jewel Idol' can wear the long-admired 'Diamond Coord'. Who's going to be?!(Source: PriChan Wiki, edited)