Watashi no Shumitte Hen desu ka?

Maiko Fujimiya is a second-year high school student whose hobby is admiring girls' butts.She likes to stand at the bottom of the stairway closest to the female-only train and stare upwards. However, she doesn't adore all butts equally; her type is a big, sexy, plump ass. Fortunately, she has noticed a girl with the perfect butt riding on the same...