The female student who plays chess is proud and doesn't want to lose to others. She succumbs to the demands of a middle-aged man's penis and becomes a sex toy with a craving for penetration. (Watanabe Mao MKON-077)

Mao Watanabe is my girlfriend and the granddaughter of a famous Go player. Despite her young age, she possesses the strength of a recognized female Go player in the league. In her school club match, she declared herself to be only a student, only capable of playing at a student level, and lost to the club's advisor, Mr. Takamizawa. Unwilling to accept defeat, she demanded a rematch. Mr. Takamizawa then suggested they play at his house that evening…