"Message" is MISAMO's second Japanese OST single, released digitally on April 28, 2025 via Warner Music Japan. The 4-minute ballad serves as the main theme for Kakukaku Shikajika (Blank Canvas: My So-Called Artist's Journey), the live-action film adaptation of manga artist Akiko Higashimura's award-winning autobiographical manga, which premiered in Japan on May 16, 2025. The song is a mid-tempo ballad described as carrying nostalgic warmth, with MISAMO's three-part harmonies woven over a gentle instrumental. Cover artwork for the single was illustrated by Higashimura herself, the original manga author and screenwriter. A special promotional video pairing the audio with manga illustrations was released alongside the single. The song peaked at #25 on the Oricon Digital Singles Chart but did not chart on the Oricon Combined Singles Chart, as it received no physical release. For collectors, there are no MISAMO-specific physical items tied to this release; it is a purely streaming and digital download entry in the discography.