: Find the video version on YouTube and use a tool like TubeRipper or VideoSolo to "Extract Audio" specifically in the M4A (AAC) format.
: A version released by ｌｕｋｅ✨ which is often used for offline listening via their app.
: Platforms like Audio.com occasionally allow direct downloads of fan edits in MP3 or WAV, which you can then convert to M4A using a free tool like Convert.Save.
While there is no "official" studio release of by the band itself, several popular fan-made versions are available for streaming and downloading through community platforms.