Also known as: モニタリング, 视奸, モニタリング(DECO*27)
A Vocaloid song by DECO*27 featuring Hatsune Miku with PV designed by Kee (Kehe).
About ten months after the initial release, on September 5th, 2025, DECO*27 released a "Best Friend Remix". While the original seems to be about an obsessive stalker, the remix offers a new perspective with different lyrics and PV with the endings of each PV reflecting the perspective of the other.