Is there a happy ending to Demon's Night?

[VelcroStraps]

I played the game recently and seemed to get only one or two outcomes, both of which seemed to end rather briefly to seem like a proper ending(plus, neither of them were exactly positive).
Now, I don't understand Japanese and thus my ability to navigate the game is a tad dodgy, but there didn't seem to be a lot of options, so I think I managed to try them all out.
Any idea where I might have gone wrong?

[JG]

There's three endings but I dont think any one of them is "good".  Two of them are game overs (wait for dyna to heal, and refuse to join the demon and succubus and thus die), and the third is the "true" ending (in which you join forces with them)