This story uses a few terms from Japanese, which I'll put in here. I'll add to them as I go.
Shougi: Japanese board game, very similar to Chess, played between two sides of the same colour pieces are differentiated by orientation rather than colour.
Oute: Check
Tsumi: Checkmate
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Mamushi
FantasyIn a little town in rural Japan, Kou Nakamura, a not-so-normal junior high school student, finds himself drawn into the dark, magical and slithery world of the hebi-tsukai, the snake-witches.