I've never spent any of the koban I've earned on anything, and had 40K+ of them. And I've been wondering what's the best odds for getting girls in Epic Pachinko. 10 game guarantees 1 girl, but what if 1 game is 12% chance or something like that?

So I thought, "Let's find out!".

I just played 74 Epic Pachinko single game, and got 5 girls. That's ~6.7% drop rate for non-event time. Of course it might be different during events, I dunno.

Totally not worth it, save your kobans and do 10x play instead.