I was trying to find this old anime I used to watch, it was about a boy and 2 girls (1 with red hair and I remember the other one had blue hair) and they had to find these mechas.
I remember there was one episode where they went to a resort and they had to do an anagram phrase to gain entry, inside they found people using their sweat and selling them as energy drinks (sorry I remember the scene clearly but not the title of the anime).