There is no official in any anime adaptation. The anime series was released in two separate OVA formats:
Often listed as the first "episode" in unofficial collections. Yume no Naka Part 1 & 2 aki sora episode 4 verified
When searching for "Aki Sora Episode 4," it is vital to distinguish between the various anime adaptations and the original manga chapters, as there is no single "Episode 4" that exists across all formats. While the manga contains a fourth chapter, the anime adaptations consist of short-run Original Video Animations (OVAs) that do not reach a fourth episode. The Reality of "Episode 4" There is no official in any anime adaptation