My Lip (Chu!) Friend I Only See On The Train Yuri Sasahara, Rion Izumi

Lion, a lesbian student, falls in love at first sight with Yuri, an office lady she occasionally sees on the train. One day, Lion sees Yuri sleeping and secretly kisses her. Yuri notices after being kissed several times and feels a strange emotion... but she doesn't interfere beyond that, and they develop a peculiar relationship where they only kiss when meeting on the train. When they learn each other's identities, they leave the train and it develops into lesbian acts. A lesbian story connected by the lips of two women who love kissing.