The Dark! Fear of the Underhell

B't X · Episode 18 · “The Dark! Fear of the Underhell”

Teppei is going to visit his older brother Kotaro Takamiya during a scientific conference after training with a mysterious woman named Karen for the past 11 years. However his plans for a family reunion become stalled when a woman named Aramis kills everyone in the conference to kidnap Kotaro....