Tremble All You Want (2017) on Netflix

Plot summary

Yoshika Etō, a 24-year-old accountant, has never had a boyfriend. Her mind keeps returning to Ichi, the boy she liked in middle school, though the two have not talked for years. At the office a colleague she calls Ni, meaning number two, begins to show a romantic interest in her, and she starts meeting him outside work while she goes on picturing Ichi. Alone in her apartment she reads about extinct animals on Wikipedia, ammonites most of all, and has a fossil sent to her by mail. Before she will commit to Ni, she decides she has to try to see Ichi again. She pretends on social media to be a former classmate and invites their middle school class to a reunion.