This looks like Japanese Romaji (Romanized Japanese). Based on common light novel, manga, or web novel title conventions, this is likely the beginning of a longer title. A probable full title could be:
Based on search volume for similar phrases, is statistically most likely. This suggests the story is not about prevention but about accompaniment . The protagonist will not save her from falling; he will fall with her. Toshoshitsu No Kanojo Seiso Na Kimi Ga Ochiru M...
If you were looking for a specific or light novel version (which often serve as the "paper" source for such animations), it was originally based on works by the creator Amam (雨あられ). Toshoshitsu no Kanojo: Seiso na Kimi ga Ochiru made - IMDb This looks like Japanese Romaji (Romanized Japanese)