規則線

「規則線」 is a single by 鏡介, a Japanese-language AI music act, released on Spotify and the other streaming services on 23 March 2026, with the DistroKid-style placeholder imprint 10952606 Records DK on the ℗ line. The track runs about 2 minutes 17 seconds, and an official music video went up on the act's YouTube channel on 2026-01-09. Its title, given in English on the video as "Rule Line", is a coinage about boundaries, and the video description says only that "we are fenced in by rules". It is the oldest of these singles, out in March. The upload credits 鏡介 for the lyrics, the music video and the direction, and Suno AI for both the music and the vocal, with the artwork and moving images made in Midjourney. By 2026-10-02 the video had about 69,478 views on YouTube, and the track 4,917 plays on Spotify.