- Relationship Voice Actor:
- Mammon, Belphegor, Asmodeus and Belial are Fighter, Mage, Dark Elf and Valkyrie.
- Similarly, they're also came from High School DXD with Mammon as Rias Gremory, Belphegor as Rossweisse, and Belial as Akeno Himejima.
- Lucifer and Mammon are Juri and Laura, Homura and Ryōbi and Shizuku and Kou.
- Michael and Mammon are Onsa and Tazuko, Bozes Co Palesti and Yao Haa, Fumitan and Lafter, Mayumi Kisaki and Emi Yusa.
- Leviathan, Lucifer and Mammon are Sisti, Celica and Eleanor.
- Belphegor and Asmodeus worked together as Sora and Kyouka & Yukino.
- Lucifer, Mammon and Belial are Yachiyo, Izumi and Kozue.
- Belial and Belphegor are Michelle and Erika. They also voice a same character as Lenalee Lee.
- Schedule Slip: Despite this being a 12-Episode Anime, the studio ended up having to produce not one but two Recap Episodes. This caused the anime to lose its timeslot, resulting in the final episode being delayed two weeks more. Altogether, the last episode aired with a four weeks delay.
- Troubled Production: Definitively, with all the Schedule Slip coupled with the financial troubles the studio was going through. However, specific details are unknown.
Trivia / Seven Mortal Sins