User blog comment:Vangui/The end of Nubee? The end of Valkyrie Crusade?/@comment-26751061-20151219134331/@comment-25197258-20151220034630

The only game I know with that idea is Touhou Card Quest Offline. It is a puzzle game, but it is offline and has gacha, Obviouly, everything is free (there aren't in app purchases), since ZUN wouldn't allow a game with them.