How to use Limited Gacha Sticker Voucher in Project Sekai 

1. Go to Menu
2. Head to Exchange
3. Click on Gacha Sticker Exchange
4. Exchange Gacha sticker voucher for characters etc.
You can go on any Event Gacha and Exchange the Sticker Gachas for Characters even if the Gacha Banner is finished, as long as it hasn't expired yet.
The difference between The Gacha Sticker vs The Gacha Sticker Vouchers is that you can stack vouchers and use them for future banners while you can only use the stickers in that specific banner overtime.
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