MOON-017 I became a fuck buddy with the part-time sister who works at the mahjong parlor and kept fucking her all night long, cumming inside her four concealed kanji

A slender woman named Anzu works at a mahjong parlor. One day, she plays mahjong with a man who was brought to the parlor by her boss for the first time. The man is drawn to her kindness and starts visiting regularly. Their relationship gradually develops into an adult one. After playing strip mahjong, they spend the night repeatedly entwined. Where will their love, full of strategizing like a game of mahjong, lead them…