I am dead inside now. Used up all my items and didn't get Chise. Too much Aoe and Urumi.

Try farming some R-Gacha tickets for a couple of days (via the chance rolls mision), and then go for Kurito plus some other items.
Many people here got the limmed SSR just with silver buttons, and I got mine with a golden button (can't remember the exact materials since I wasn't expecting that to work, lol, but I think it was something like R-tickets + Peronamin + Card reveal and another random item).

Event just using 1 R ticket may work, but from what has been said here, odds are very low, so I wouldn't recommend that. Try R tickets plus something else. :3

Okay guys, I just got the Limited SR and Limited R with just 1 peronamin, thought I should share

After i readed this tread i started to play with kurito.
Till now i used 15 r-gacha tickets, each try one ticket and i got allready the N and R Card,
in my oponion a good way to farm, beside the try to get the cards ,almost every try gives an sr wild 3 card.
Good way for me to prepare the lvling of the slayer cards

If you got all limmed girls I would wait untill the limmed girls change. After the first 3-4 months with the same girls the girls started to change every month. Collecting 300-400 R-Gacha takes time...

If you just want level for you SR girls donating 1x R-Gacha give on average give 2.5 SR level.

Ing:
R.Gachax3
Pero.Puddingx2

Silver:2hrs

Result:
Peronaminx1
Peronamin.Halfx1

speaking of bad luck...

Any tip for the limited N ? I tried it for a month and still haven't got it yet. I keep playing with R-ticket and I got SR-3 WC mostly 90% of all time.