Gacha
Gacha(ガシャ) is a system in which star jewels or friend points are spent to obtain cards and trainer tickets. There are two types of Gacha: Local Audition Gacha (ローカルガシャ)and Platinum Audition Gacha(プラチナガシャ).
Local Gacha
In this mode, friend points(which can be stored up to 10000 points) is used to draw cards and trainer tickets. Each Gacha costs 200 points and you can do 10 gachas consecutively at a price of 2000 points. Moreover, you can have ONE free-of-charge gacha everyday.
Trainer card, normal, R and even SR cards can be drawn from the gacha, although the chance of obtaining an SR card is very low. Note that if you don't have enough card slots, you won't be able to do the gacha.
Platinum Gacha
In this mode, star jewels is used to draw cards. No trainer cards can be obtained. Each gacha costs 250 star jewels and you can do 10 gachas consecutively at a price of 2500 star jewels, and you can obtain at least one SR card as guaranteed.
Free star jewels will be used, and if there is insufficient free star jewels, the paid ones will be used. Moreover, using paid star jewels, you can take a draw for 60 star jewels only, nut you can only do that once a day.
R, SR and SSR cards can be drawn. The chance of getting a SR is 10% while that of getting a SSR is 1.5%. If there are insufficient card slots, cards will be put at the "present" section.