Do dreams come true? 24 years ago, schoolgirl Nazuna (TOUMA Ami) wrote a letter to her first love, hoping to give it to the boy she saw each morning as they rode the same train and the same car without ever sharing a word. But she never got the chance. The boy died before she knew his name or who he really was. Shinsuke (HOSODA Kanata) was awkward and principled, a high school student who lived for boxing and the belief that if you put your mind to it anything was possible. Now a young woman with a family of her own, Nazuna puts on a brave face to hide a painful truth, triggering memories of that train ride and the boy she thought long forgotten — time may pass but nothing really changes. Directed by ISHII Yuya with a strong cast of supporting characters, from Shinsuke’s senior at the boxing gym and trusted mentor Kawashima (SUDA Masaki), Nazuna’s awkward yet caring husband Ryoichi (TSUMABUKI Satoshi), and Shinsuke’s father Ryuji (SATO Koichi), who seeks to understand his son's life more deeply even after his death, One Last Love Letter is a story about how time catches up with everyone, where the connection between strangers can be the strongest connection of all.