Sayaka is the captain of the railroad club that the protagonist attends. She is also an honor student in both military and literary arts. As with the other heroines of Love Choriss, Sayaka's personality can be tweaked depending on the player's choices. The Sayaka raised by Kondo had eyes for him and only for him until it was revealed that she was actually Okita's Sayaka, who was conditioned into a masochist and forced to love a man who she did not love. Whether this Sayaka was originally Kondo's or Okita's is unknown, but is implied to be the latter. Other Sayaka's from other players' games have also been brought under Okita's control despite their original allegiances to their respective players.
However, playing on Sayaka's masochist characteristics can lead to a backfire, as seen when shortly before Okita takes her to the love hotel, Sayaka beats him to the ground, switches her outfit for dominatrix leather, and then proceeds to dominate Okita, who is unable to resist, and beat him while in their room in the love hotel.