Yoru no Sensei (2014)

After several setbacks in her life, 38-year old Yano Sakura became a Mama-san at a snack bar. Taking on the bitter and sweet that life has to offer, Sakura is a woman who lives life to the fullest. One day, her frequent customer approaches her and offers her a job as a teacher at a part-time high school, on the condition that she will be fired should even one of her student quits the class. The students of her class come from all walks of life, and are all at various stages of their lives...