Rika and Atsushi are close siblings.
A naughty brother and sister who have been flirting since childhood and are famous in the neighborhood.
They each get boyfriends and girlfriends, but they end up feeling more comfortable with being siblings, so they don't last long.
Rika studies AV in order to please her beloved older brother. She learned about her slut play for the first time.
She bravely tries to play as a slut, but is beaten back by her sadistic and kind older brother.
