My Japanese isn't that great, and I think anyone fluent may notice a few errors in the script. Overall though I hope you all enjoy! Credit goes to the artist for the background and character, please contact me if you see an issue or want the video removed!
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app