The murderer is revealed to be Rumi , one of the band members.

The episode follows the investigation into the death of , a female drummer found strangled in a rehearsal studio.

Rumi used a cell phone recording trick to manipulate the timeline of the murder. By filming vertically, she was able to hide specific movements while playing a recorded keyboard track to make it seem as though Hagie was still alive and sleeping during the rehearsal.

Beyond the immediate case, this episode is a "manga-canon" entry crucial for its character reveals:

The murder was fueled by a tragic misunderstanding regarding a former bandmate, Akane, who had committed suicide. Rumi believed Hagie's harsh words about Akane’s voice drove her to it, though it was later revealed Akane actually died in a selfless accident while trying to save a child. Major Plot Developments