Originally Posted by Unregistered

Tons of Rs, 2 or 3 SRs and still don't have the N-card. Also running out of R-gachas after the valentine limited cards. Any suggestion on what to spam now to get the N?

Literally from page 2 of this same thread:

Originally Posted by Nutakum

Peronamin x2
R Gacha x4
N Gacha x10
Candy x10

has resulted in limited N - Shihoko Fukui cards 3 out of 13 times (not quite 25% drop rate)
11 of 13 @ 2hr30min
2 of 13 @ 3hr
All limited N card drops came @ 2hr30min wait times

If you're looking for some magic 100% drop rate combo you're going to be disappointed. Find something that works and repeat it until it works for you. Or just get lucky.