ALWAYS- SUNSET ON THIRD STREET is set in 1958 Tokyo. Norifumi Suzuki (Shinichi Tsutsumi) owns a small auto body shop named “Suzuki Auto”, where he works and lives with his loving family. One day, he comes back home with a new employee, Mutsuko Hoshino (Maki Horikita), who moves in with the Suzuki family. However, Mutsuko had expected that Suzuki Auto would be a big company so she is disappointed to see howsmall the shop is.
Meanwhile, Ryunosuke Chagawa (Hidetaka Yoshioka) lives alone across the street from Suzuki Auto. Chagawa is a writer of pulp fiction stories who runs a candy shop to make ends meet. He is asked by Hiromi Ishizaki (Koyuki), the woman whom he secretly loves, to look after a boy called Junnosuke (Kenta Suga) who has no place to go. Chagawa doesn’t want to live with Junnosuke, but he agrees to do so for Hiromi.
After a while, the two new residents become part of the close-knit community of Third Street, but the situation changes when Junnosuke’s wealthy father Yasunari Kawabuchi (Fumiyo Kohinata) shows up to take his son away from Chagawa, and Hiromi suddenly disappears.