A companion app for Vita shares save data (transferred manually via PSN) with the PS4 and PS3 versions of
Ishin, and allows players to grind on the go. Battle Dungeon serves up waves of enemies to eviscerate for XP, with skills and items carried back and forth from the main game, while other modes offer vegetable farming and gambling minigames such as mahjong and shogi. The Vita app is also playable without purchasing the main game. Importers beware: the app is only available from the Japanese PSN Store, and the main game must be registered to the same account if you want to transfer data.