Garo under the moonbow (2019)

Lurking among us are the Horrors, ancient enemies of our kind. Holding the line against them, down through the ages, are the Makai Knights. Assuming the aspect of Golden Knight Garo, Raiga Saezima has vanquished one such demonic creature, but his magical armour has been tainted with evil. Furthermore, a Knight of the dark has materialized, and taken hold of Mayuri, so dear to Raiga. If he hopes to rescue her, Raiga must board a mysterious train destined for the netherworld. As he advances through the cars of this train, Raiga comes ever closer to confronting his own hidden truths…