A factory explosion plunges a small town into a timeless freeze, leaving teenage Masamune and his pals to grapple with a quickly collapsing reality.

Once upon a time, in a far, faraway place, there were two lands. The world was divided into an inner land and an outer land. People feared the outer land, inhabited by eerie beings, the carriers of curse. One day, on the border to the inner land inhabited by humans, one such being finds a girl on heaps of abandoned dead bodies. The girl says her name is Shiva and shows affection to the "being" who found her, calling him "Teacher." This is a story of two people—one human, one inhuman—who linger in the hazy twilight that separates night from day.

THE IDOLM@STER SideM 9th STAGE ~MIR＠-CIRCLE CRESCENDO~ was a two-day live concert that will take place in Makuhari Messe International Exhibit Hall 9-11 on July 14th, 2024

THE IDOLM@STER SideM 8th STAGE ～ALL H@NDS TOGETHER～ was a two-day live concert event that took place on October 28th and 29th, 2023 in K-Arena Yokohama.

Story begins when Koala asks Butt Detective to find a missing relative who disappeared from an idol contest. The case takes Butt Detective to Stardust Island, the site of the contest, and also the home of the international criminal organization Phantom Thief Academy, headed by Phantom Thief G. Here, the organization advances its secret conspiracy, codenamed the Dark Age Plan. Butt Detective enters Stardust Island under the guise of an idol. At the same time, he joins forces with Phantom Thief U, who is out to steal back the valuable Moonlight Stone from Phantom Thief G. The story will also reveal more about Brown's past.