So jealous. I had a huge stockpile of peronamins. I got tired of using R gacha tickets, so I tried using 10 peronamins, 10 half peronamins and I think four R gacha. That was the minimum to get the 'feed' button to turn gold. Admittedly, I got some decent stuff, but I did not get the SR.

I fed kurito 3-4 R-gachas to get 1 R-gacha in return. -_-
I fed most of my namins and got four copies of the R card (and two Ns).

I still cannot get that squirrely bitch to give me the SR. Some people have gotten it for damn near nothing. It's frustrating. But that's how it goes. You can feed her a lot and get nothing, or you can feed her nothing and get a lot. It's luck of the draw.