Some of you have seen this option, and got excited. I’m here to curb your enthusiasm.
DOAXVV: Unlocking Girls via the Venus Shop

Yes, this is a legitimate way to unlock new girls, I do not deny that. But please, bear with me as I do some math.
Each and every girl has their own Character Token, and Tokens are obtained at a rate of 20/SR at the Trade Outfit shop.
In order to unlock a girl using this method, you’ll need to obtain 50 individual copies of her SR swimsuit (50 x 20 = 1,000).
You can’t buy a girl’s SR from the Event Shop if you don’t have her unlocked, so that means the only method you have of getting any of her SRs will be from the Gacha.
Let’s use the Venus Gacha as an example. Assuming you’re always doing the 5,000 V-Stone pull for the guaranteed SR, that rounds out to about 250,000 V-Stones to get 50 SR swimsuits.
That’s being silly, so let us assume you get 2 SRs every time you pull a 10x Gacha.
That means you have spent 125,000 V-Stones in order to get 50 SR swimsuits. Now, the Venus Gacha offers equal rates for all SR-rarity swimsuits, so you should have 5 SRs for every girl.
You’re going to need to repeat the entire process 10 times for a total of 1,250,000 V-Stones in order to get the 50 SRs needed to unlock the girl with this method. You’re also going to unlock every single girl in the game with this method, so that’s a nice bonus I guess.
Know what’s the best part? The girl you just unlocked will have nothing but her default swimsuit, which means her stats are absolute garbage until you get another SR.
Long story short – don’t bother. Save the SRs and fully awaken them before trading further duplicates in for Tokens. Trust me, you’ll get her SSR long before you manage to amass 50 SRs for a single girl.