Credits:
TL: arbshortcake, xIceArcher
QC: Dyrea
TS: Yujacha, AirCookiee
KFX: AirCookiee, Dyrea
Source/Encode: NHK

FAQ

Can I have your permission to use your subtitle files to re-translate to X language?

Yes, you can use mkvextract to extract out the necessary files, or download the subfiles directly. Please give credit where appropriate.

I see a bunch of weird video/subtitle issues.

Use the latest version of mpv instead.