"Shota" had a game of rating the butts of women passing in front of him. Then, lo and behold, a perfect 100-point butt passes by. He hurriedly chases after it and, carried away by his momentum, ends up entering the genkan of the owner of said butt. Her name is "Naoh". Shota can't contain his excitement over Naoh's firm, athletic butt and starts approaching it!
