Girls with Guns
Chuunibyou
Ancient Magus' Bride, seven episodes with next door neighbor - we finished Season One's last four episodes 9-12, and then I showed her the three prequel OVAs, because she had missed them and watched the first three episodes of the series on her own first, before I got to her. After watching the OVAs both before and after the first season, I feel they should definitely be watched before the series, as they had been aired, as it makes much more sense to get Chise's backstory details then, so you can better understand why she is like she is, going into the series - even though the introductions of Elias and Ruth's characters within the series are spoiled a bit by their appearances in the OVAs.