I don't see people talk about this amazing game nearly enough, despite being easily one of the best shooters on the entire system (I'd honestly say it beats out even the Aleste games!). It's really mindblowing to think that it was made by one dude while he was still in high school!
Anyway, the game seems to have multiple endings, and based on the one longplay I've watched on YouTube, I can't figure out how to get to any of them beyond Ending Rank F. Basically, when I beat the boss of stage 8, the game ends abruptly with one screen labeled "Ending Rank F," then spits me back to the title screen. But in the longplay, there's a pretty cool cutscene after stage 8, followed by stage 9, then a time-travel story screen and stage 5', where you get to stop the event that destroyed Japan and see the true ending!
There are a number of possible factors I can think of that might trigger the rest of the game and the good ending -- there are 12 playable characters, after all, as well as 5 difficulty levels. And maybe the game only lets you through to stage 9 if you managed to get that far without continuing or something -- who knows?
I beat the official English release of the game on difficulty level 3 using the character Kujira, and I continued A LOT because I'm not very good at shmups (though good enough that I did EVENTUALLY beat it, I guess!), so literally any one of these factors could be the trigger. And I was kind of hoping that someone on here might know which it is, so I can focus my attention on working toward the true ending in future playthroughs -- if I need to beat the game with all 12 characters, for example, then I'll use someone different every time from now on. Or if I need to beat the game on difficulty level 5, I'll... cry.
If anyone knows the trigger, or can help figure it out, please let me know!
(Incidentally, I don't think whoever translated the game to English knew about Ending Rank F, since Kujira's ending screen was still in Japanese!)
For your reference, here's the longplay I watched:
https://www.youtube.com/watch?v=O2kJoRJpyis
The point of divergence for me is at 34:20 -- after beating those two characters, the game just ended for me, whereas it continues for this LPer. (And yet this guy still only got Ending Rank C!)
Also, because this is a good chance to do so, here's my favorite track from this game's overall stellar soundtrack. Some really, really nice FM music in this one!
https://www.youtube.com/watch?v=tnn3ccZua9k
Thanks for any help anyone can provide!
-Tom