| Spoiler warning!|
This article contains plot details about an upcoming episode.
|Anime||Returns Series Episode 15 Murder at 10000 Meter Altitude|
Mamoru Koganei is a co-pilot of JAM Airlines(fictional), also a suspect in Murder at 10000 Meter Altitude.
During his flying career, Koganei's captain, Tomoaki Shida found him smuggling drugs into an airplane. Desperate to keep the captain quiet about this, Koganei convinced his fiancee, Yui Kagaya to help him kill the captain.