ONE YEAR LATER, I DO A SECOND AND THIRD PLAYTHROUGH AND GET ALL THE ENDINGS. C end is best, though it's also got the hardest final boss. Also I still don't know everything that affects fame (it still went up/down seemingly randomly at some times during battle, unrelated to Kiss of Death but possibly related to items I picked up), but I do know that usually it just changes based on how fast you clear each BF in comparison to the MVP/Excellent bonus turn limit thing. If you go over that, you'll get negative fame, but if you go under it you'll get positive fame. I don't think it's possible to get negative fame before chapter 3, though, even if you go over it every time.
SO HOW TO GET THE ENDINGZ, JUST IN CASE ANYONE STILL NEEDS TO KNOW:
» Click to show Spoiler - click again to hide... «
To get the A Ending:
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Have positive fame. Your fame at the end of 7-5 is probably all that matters, so if you want to run around for the rest of the game with negative fame people probably won't care.
To get the B Ending:
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Have negative fame. Your fame at the end of 7-5 is probably all that matters, so if you want to run around for the rest of the game with positive fame people probably won't care.
To get the C Ending:
» Click to show Spoiler - click again to hide... «
Item trade quest woo! Make sure you don't eat/equip any of these~ They usually look like a white rectangle with random blue fish/manta rays on them, depending on what you have at the time. The last one, Manta Mantle, looks like a pointy black robe thing.
- Chapter 3. Do 3-1 (Locomoco BF, it's A in the map I posted ages ago) and visit the sourthern town twice to get Fish Print (魚拓).
- Chapter 3. Do 3-4 (Fiebee stage, it's C in that same map) and visit the northwestmost town at night to trade your Fish Print (魚拓) for Rare Fish Print (珍魚の魚拓). Also, you can get both of the items this town gives, so don't freak out or anything just because maybe you went there during the day first.
- On BF6-1. Trade your Rare Fish Print (珍魚の魚拓) for Manta Fish Print (マンタの魚拓) at the town on the right.
- On BF6-5. Trade your Manta Fish Print (マンタの魚拓) for Manta Mantle (マンタのマント) at the town on the right.
- On BF7-4. Move Ishut to the village in the lower right corner for a little scene involving Ishut hearing voices and bright light. Then you're good, just go through the game and you'll get the C End. You can probably equip the Manta Mantle after doing this, since there's no other steps and you don't lose it and it's a TOTALLY AWESOME ITEM.
Also, as much as I whined about Pamela ruining everything in my second playthrough because she was weak to all the ridiculous Undines in the game (MOST NOTABLY THE JERK WITH THE ROSARIO OF ASSHOLERYHOPE (which is the Rosario of Hope you know, except its effect is blocks charges instead of the useless thing it had before)) THE FACT IS PAMELA IS AWESOME IN THIS GAME. All because of her skill that gives her the full power of Geo cards regardless of terrain. Which means: you can have everyone anywhere eat that glorious Tec+4 - Gen damage formula and you can overkill any Undine that isn't already dead. I maxed out Sand Storm in my third playthrough because it was just too good. My only regret is that I didn't also use Man Trap.
And Fiebee IS top tier (AND UM "なんだ? 殺す前に私で楽しもうと言うか。 だが残念だったな。 私の下半身は魚だ!" OKAY WHATEVER YOU SAY FIBBY BUT I THINK THEY COULD TELL JUST BY LOOKING AT YOU SO OBVIOUSLY NOBODY WAS THINKING ABOUT THAT IN THE FIRST PLACE), and Hard mode AI IS a huge jerk. And 6-4 will forever live on in my memory as the worst BF in the entire series.