Masato Fukuroi, a shy young man and former aspiring writer, takes a summer job at a beach resort where he unexpectedly reunites with his high school crush, Chihiro Asaoka. Though intimidated by Chihiro's handsome companion and his own insecurities, Masato discovers that his first love has never stopped caring for him. Their passionate reunion not only sparks a long-distance romance but also gives Masato the confidence to pursue his dream of writing once again.
Masato's romantic life spirals into chaos when he agrees to a trip to Tokyo with the impulsive Rei Kashiwazaki, leading to a passionate affair that causes him to neglect his girlfriend, Chihiro. After canceling their plans, Masato is heartbroken to find Chihiro with another man, leading him to believe that her professions of love were nothing more than a lie.
Fukuroi finds solace in a new relationship with Miku, a fellow aspiring writer, but he remains haunted by his breakup with Chihiro. When Miku discovers through Fukuroi's novel that his heart still belongs to his ex, she selflessly urges him to pursue her once more. This leads to a poignant reunion where Fukuroi and Chihiro forgive each other's past mistakes and decide to give their love a second chance.