A live-action version of the popular NTR douujin "One Move of Ruin", which depicts the fall drama of a female teacher who writhes between anguish and pleasure, with S-class exclusive Rena Kodama! Maika, an adviser who is surprised at the sudden withdrawal notice of Go club ace Yamamoto. Yamamoto has pointed out "a certain condition" to her who persuades her to keep it. At first, Maika was poking, but she continued to worry about being caught up in the surroundings, expecting his ability to win the national championship. And after thinking about it, she pointed to the worst move ...