Wow, you’ve really made a lot of progress! The girls’ fourth outfit is the exhibitionist one, which means you probably haven’t seen all the exhibitionism events yet. Sending Kira, Sakura, or Natsuki again will trigger different scenes, and once you’ve completed them all, it will just show random images.
On another note, is the error you’re getting something like an ‘infinite loop’? I’m working on fixing that issue and hope to have a solution ready for the next update. Thank you very much for playing!