ATTACK ON TITAN OVA

OVA 1: An old journal is found by Levi and Erwin when they conduct the surveillance operation outside the wall. The contents of "Ilse's Journal" result in some unexpected actions from Hange. OVA 2: Another story of the 104th Trainee Squad. OVA 3: Will depict a "memorable episode before the 104th Training Corps became unified." (Source: Anime News Network) — Description from AniList community (anilist.co).