- Role-Ending Misdemeanor: Fairly minor example. Kunogi Kenbishi became a member in January 2019 after Sari and Hina's departure, and she had to leave the unit in September of that year because of a gravure photoshoot that wasn't authorized by the management. She's still in the idol business though, under the name Kunogi Haruno.
- The Pete Best: This article details Necroma's early history and mentions the members that left the group before even the first recording session.
Trivia / Necronomidol