Tazza : The Hidden Card.
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loli, illusion, Koikatsu! / K - 41 (card) - pixiv ... pixiv
Koikatsu Overlay Mods - KSOX (KoiSkinOverlayX) and KCOX (KoiClothesOverlayX). These additional textures are saved inside the card and used by the main game and studio.