Originally Posted by Light Kamijou

Is there a way to confirm SR get from Kurito?

Not really. Giving enough for a gold button (10 R Gacha and 7 Glasses seems to do the trick) does raise the chances of getting the SR card, but I still had to do that 4-5 times before managing to get the current one. On the next day, I got a second copy by dumping my almost expired raw pudding halfs (6 raw pudding halfs + 10 candies, copper button, 50 min wait time), which goes to show that you can never be sure what to expect.

If you've already gotten the N and R cards from Kurito, go with 10 R Gacha and 7 glasses to get it soon-ish. If you still need those, go with 1 R Gacha (or 3, if you feel adventurous).