I personally went straight for the true end D:
Although i played JAD already (and several times!), i didn't understand the JAD2 loop, and though it meant the campaign was over >.>
Now when replaying it, i didn't know about the end, and wanted to kill the big lucifer for the lulz.
The result was the PAL departing and winning right away (?!)...
It then required me 15 mins talking with Axem to understand WTH happened.