Touhou ~ The Tiles That I Cannot Cut Are Next to None! (Doujinshi) - MangaDex
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A mahjong craze has swept Gensokyo. Youmu, a total beginner at mahjong (with a completely useless ability at that), has no choice but to go against the top players of Gensokyo – for her mistress' honor and her own!

The Marisa vs Kaguya match is extremely good