WS TCG サポートツール (UTool for WS) is a tools app by Yumemiware with 10,000+ downloads (about 27K estimated). +34 installs in the last 7 days. Rated 4.3 from 353 ratings. Released Nov 17, 2016. Install growth, rank history, SDKs and ad networks.
From the store listing: “To do the support to enjoy more the TCG "Weiss" that are sold from Bushiroad like it is a tool for the purpose.”