Book Four: Duet
Childhood friends with opposing personalities, Mingi and Ryan, dream of becoming rock stars but find themselves on the Infinity Train. They explore the locomotive's inner puzzles — and their own relationship — in order to return home, together.
Episode Guide
Once great friends, Ryan and Min-Gi's relationship slowly dissolves over the course of years of disgruntlement, culminating with their reunion in the restaurant.
Book Four: Duet FAQs
The cast of Book Four: Duet includes Johnny Young as Min-Gi (voice) and Sekai Murashige as Ryan (voice).
Episodes run about 11 mins. The total runtime is about 1h 50 mins.
Book Four: Duet was released on 15 Apr 2021.
Book Four: Duet has 3 seasons and 10 episodes on Fanbiz. Available seasons include Book One: The Perennial Child, Book Two: Cracked Reflection, and Book Three: Cult of the Conductor.