This is a real crap...
Yesterday night I reached Neifirst. Nei fought bravely but Neifirst was always using NaResta from time to time until she wasted all of Nei's TP on Deband and NaResta, as she learned NaResta on Lv62, just before Neifirst, what the luck.
Then Eusis came... And it was seemingly impossible to me to beat her as I forgot to stock on Trimates before going to Climatrol.
This morning, I decided to make the dungeon all over again after stocking up.
Just the miracle had to heppen this time!!! Nei defeated her sister!!! 1200+ Exp Points!!!
And then...

Farewell forever, Nei... I'll never forget your bravery and ability to raise levels at double the speed of everone else...
Now, moving on with the game. I'll keep Amia for the time being. And there I go buy equipment for her...
