Haven't read Case Files much, but what I heard is that it ends with dr. Heartless defeated in Spiritual Tomb Albion before he succeeded in attempting...
You see, that doesn't matter because I'm a weirdo that needs to have as much context as I can before something, even if it's just a reference or two....
Honestly, Adra was boring, Twins was hype (Touko Bias Ex-), Rail Zeppelin was good (mebbe because the anime poisonned my brain), Atlas had issues but...