ah... My Nutaku ID have passive skill called Rainbow Summon.
It's grant 2-3 rainbow girls for me every month if I pull...

OK enough joke.

Like I post somewhere before, according to my junior Nutaku have very friendly gacha rate.
Because of that I decide to start at Nutaku instead of DMM.
Plus Nutaku do sell rainbow, so it's more easy to build Rainbow Wall here.

DMM gacha rate is sh*t. It's sh*t enough that you can build Salt Wall easy.
Chance you get 11 bronze or 1 silver + 10 bronze is higher than get rainbow.
It's sh*t until they have to create some compensation system called rainbow coin.
But the positive side is we won't lack of stuff to use, since they keep throwing a lot of gift to us.
I can say that we have too many gift until we can sell it to Nazuna or even roll gacha without thinking.