Tatsuhiko, a quiet high school student in the coastal city of Karatsu, spends his days fishing and drifting through adolescence. Just before summer vacation, Yoon-seul, an exchange student from Busan, joins his class. As they grow closer, Tatsuhiko gradually discovers the heartfelt reason she chose this small Japanese town. However, an innocent remark unexpectedly hurts Yoon-seul, and she abruptly returns to Korea. Unable to let go of his regret, Tatsuhiko makes a life-changing decision—to cross the sea in search of the girl he never truly had the chance to understand.
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Cast
11 people
Soya Kurokawa
Known for
Monster
Kokuho
Kim Ji-an
Known for
Sweet Home
Shadow Detective
Hayase Ikoi
Also in
Teasing Master Takagi-san
Worlds Apart
Towa Araki
Known for
First Love
Rurouni Kenshin: The Beginning
Soji Arai
Known for
Pachinko
Tokyo Vice
Park Ji-hwan
Known for
Touch Your Heart
Gyeongseong Creature
Jang Hye-jin
Known for
True Beauty
Parasite
Choi Deok-moon
Known for
Vincenzo
Are You Human?
MEGUMI
Known for
Liar Game
Helter Skelter
Wataru Ichinose
Known for
Sanctuary
Last Samurai Standing
Ryohei Otani
Known for
The Full-Time Wife Escapist
War of the Arrows
Chun Jin-rung Director
First release October 10, 2026 · Produced in South Korea, Japan · Languages Japanese, Korean
Production
South Korea · Japan
Produced in
Languages
Original title
3ミリの恋
Original language
Japanese
Spoken on screen
Japanese · Korean
Release dates
Taiwan · October 10, 2026
Premiere · Kaohsiung Film Festival
Japan · November 6, 2026
Theatrical
No release date listed for United States.
Japan
October 17, 2026 · Premiere · Korean Film Festival in Japan
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