Cardfight!! Vanguard Gaiden: If
カードファイト!! ヴァンガード外伝 イフ-if- · 2020
Sub & DubHDCOMPLETED
The series will explore an alternate universe to the main series, and will focus on Kouji Ibuki, an antagonist in the Cardfight!! Vanguard Movie: Neon Messiah, and Suiko Tatsunagi.
(Source: ANN, edited)