You only need to reach level 8 of Elena's affinity to trigger the best end. You can do it without even trying. Buy presents from Mawda if you have the spare money, return to elena before her transformation triggers. And wait until she wakes up after you gave her flesh to eat. Also, speak to her until she starts her generic quotes, like "What's up, Aeron?"
As a bonus, I spend 24 hours with Elena to talk to her after every boss fight. I reached level 9 of her affinity level and scratched level 10.
1) Never allow Elena to transform. The best ending does not require you to be perfect about this, but it will make things harder. 2) Give Elena a gift every time you visit the Observatory. If you have nothing else, a Dryad Berry will do: you can almost always get one from the birds in the courtyard or on the roof, and they're so plentiful that you're almost guaranteed to have at least one on hand at all times anyway. But you should give her more expensive gifts as the opportunity arises. 3) Always chat with Elena when you visit the Observatory. When she asks "What's up?" you can stop for the time being, but chat with her again if she goes to sleep and wakes up. 4) If Elena asks you a question, always go with the cheesiest answer that isn't mean. 5) Carry a Shard of Divinity at all times. This doesn't directly affect the relationship gauge, but it can be handy in emergencies when you're caught without enough time to get out of the tower.
If you get into these habits, then you shouldn't ever have to go out of your way to get the best ending. --- "Playing a game for its graphics is like watching pornography for the story." - Kadiroth
Get all the bonus rewards from the towers. A lot of times they include special gifts.
That's a moot point. All bonus rewards can be found in NG+, either because Mawda sells them or because they are behind the locked doors. Plus there are plenty of presents sold on the first playthrough. Many items can be gifted twice, like the cloth or five times, like the flower seeds. And seeds aere easily the cheapest gift you can buy.
Do not giver her beast belongings like Beast Fang, Large Bone, Srrange Grains, etc. These will disgust her and decrease her bond with you by a big downslide. [Giving her these gifts is the best way to get to level8- fast if you want 100% though.] --- Sure, Daze Bombs are great against cocoons, but they're also a reliable tool against hackers;) -DAZEBOMB The Last Story (PAL) FC: 2924-4011-4435
That's a moot point. All bonus rewards can be found in NG+,
If you're in new game+ you've already gotten the ending. If you want to get the best ending the first time, this is not an option.
Achieving the best ending isn easy, even without the rewards. As I said earlier, youi can get enough affinity without even trying. Also, earning enough flesh to unlock those is more trouble, than spending time with Elena. There are still more than enough gifts on your first playthrough and spending time at the observatory dioesn't affect Elena's curse.