The anime series officially consists of only two OVA episodes and does not have a fourth episode. Any mention of a "verified" episode 4 is likely referring to a mistitled chapter of the original manga or fan-made content. Fact Check: Aki Sora Episode Count Aki Sora (OVA) : Released in December 2009 (1 episode). Aki Sora: Yume no Naka (OVA) : Released in July and November 2010 (2 episodes).
If you are looking for or want to know which manga chapters pick up where the third episode left off, I can certainly help you find that information. List the exact manga chapters that follow the anime? Recommend similar series that actually have full seasons? aki sora episode 4 verified