Gunvarrel is the famous robot from a popular anime series of the same name in the Robotic;Notes franchise.
Minami Kogori (Frau's mother) is the anime director of the series. When 13 of the staff were mysteriously killed off and Minami is gone, the last episode never aired. Rumors build around the last episode into the present.
Characters are introduced as BOTs on Frau's computer.
|1st manga book:|
|1st anime episode:||Robotics;Notes #1|
|1st anime movie:|