A Day Before Us Zero is now available to stream on YouTube with both English dub and subtitle options. This 19-episode original net animation (ONA) from Red Dog Culture House delves into the formative high school experiences of Wook and Yeo-reum, the central couple from the original A Day Before Us series.

The anime focuses on the characters' growth during their teenage years, introducing new personalities and weaving their stories into the established narrative. It explores themes of coming of age and young romance within a school setting. With a MAL score of 7.17 from over 10,000 voters, the series offers a nostalgic look at past relationships.

As a finished series, A Day Before Us Zero can be watched in its entirety. It serves as a prequel, expanding on the backstory of the main characters and providing context for their adult relationship explored in the original series.