The second half of “TRIGGER: before the Radiant Glory” is considered the second episode of the overall series.
The first 15-minute half (considered episode one) debuted with English subtitles in February 2018.
The first half of “Boys Caught Up” is the third overall episode, with the second half (the fourth episode) slated for January 27.
The second episode is available to watch for free, but the third episode below plays only as a free preview unless you have a YouTube Premium subscription.