【Sin Costume Introduction】 👕 Costume Name: Backstreet Dreams 👧 Nikke: Sin 🎁 How to obtain: BACKSTREET MAID PASS The encounter with a maid in a quiet back alley. HD Ver 🔗: youtube.com/shorts/LQInERY… Event Period 📅 1/30 12:00 ~ 2/19 23:59 (UTC+9) #NIKKE #Sin