Three Millimeters to You (2026): Cast, Story and Release Details

Prepared by Movies Dock Editorial

Three Millimeters to You follows Tatsuhiko, a quiet student in coastal Karatsu, whose meeting with Korean exchange student Yoon-seul changes the course of his summer. After an innocent comment sends her home, regret pushes him toward an extraordinary decision: crossing the sea to find the girl he never fully understood.

Three Millimeters to You is a 2026 romance drama set between Japan and South Korea. The story begins in the coastal city of Karatsu, where a reserved high school student encounters an exchange student from Busan just before summer vacation.

Their growing connection is interrupted by a painful misunderstanding, giving the film a cross-border coming-of-age premise shaped by regret, distance and the difficulty of expressing what matters in time.

Three Millimeters to You movie details

Story without spoilers

Tatsuhiko is a quiet high school student who spends his days fishing and moving through adolescence in Karatsu. His routine changes when Yoon-seul, an exchange student from Busan, joins his class shortly before the summer break.

As the two become closer, Tatsuhiko learns that Yoon-seul has a deeply personal reason for choosing this small Japanese town. But a seemingly harmless remark hurts her, and she suddenly returns to Korea. Unable to move past what happened, Tatsuhiko decides to cross the sea and search for her, turning a local teenage romance into a journey across national borders.

What to expect

The film is framed as a romance drama with a strong coming-of-age element. Its premise centers on a quiet Japanese student, a Korean exchange student, an unexpected separation and the emotional consequences of words left unresolved.

The Japan–South Korea setting and its Japanese and Korean dialogue give the story a naturally cross-cultural backdrop. The supplied premise points to an intimate story about connection, regret and the difficult choice to pursue understanding after an ordinary moment changes everything.

Cast and creative team

Three Millimeters to You stars Kim Ji-an and Soya Kurokawa. Chun Jin-rung directs the film. No writer is listed in the supplied credits, and character roles are not specified.

• Kim Ji-an
• Soya Kurokawa

Release and production context

Three Millimeters to You is scheduled for release on November 6, 2026, and is listed as a 2026 production. The film has a runtime of 1 hour and 45 minutes. It is associated with South Korea and Japan and uses both Japanese and Korean. Its listed genres are Romance and Drama.

Movies Dock view

With its coastal Japanese setting, Korean exchange-student premise and story of separation across the sea, Three Millimeters to You presents a focused romance drama about regret and the effort to understand another person. The film’s appeal will likely depend on how its central relationship develops, but the setup clearly places emotional connection at the heart of the story.

Film data:
TMDB