If you hunt for N-Girl players should imo donat one of the following : R-Gacha, Pudding, Peronamin.
Expect to do this 50-100 times before you get the N-Girl.

If you hunt for R-Girl players should imo donat one of the following : R-Gacha, Pudding, Peronamin.
Expect to do this 5-10 times before you get the R-Girl.

If you hunt for SR-Girl players should imo donat 3 of the following : R-Gacha, Pudding or Peronamin.
Expect to do this 50-100 times before you get the SR-Girl.

To get a fulll set of the girls dont be suprised if you have to spend 3-400 of any of the following: R-Gacha, Pudding or Peronamin.
When you got the full set start save R-Gacha, Pudding or Peronamin for when the girls are updated.