Thanks for all the advice.

I'm at Lvl23, stage 5 and 130 000 SED, I farm Event as I can. I thnik I have the good style of game. So you say Moe girls gains more SED at lower levels than others ? (That's why some SR cards gain 1 or 2 SED when lvl up !!!)

I will try this =)

yes. That means Moes will be less useful at higher levels of the cards. In some of them, the shift from 99 to 100 give 0-1 SED, so don't invest on them unless you have some needs (i.e. PVP). Hiyori, Runa (gacha) and Sora (Area 2) are the best Moes without events or cash.

With sexy cards you start bad, but usually final SED from those cards are higher than the rest and you can notice a boost at higher levels of that cards.

P.S: Or level Airu if you didn't before (7k SED being babe R card)