To be honest, I'm pretty sure the whole thing is just a teaser for a future game. But the developer has no central location to follow them, so I have no clue whether the next game is currently in development or what. Right now there's only one linear path with a scene at the end, plus a hidden alternate ending if you check the locker a second time after completing the scene at the pool. The purple-haired woman is the only character in the game, and I think the full-body picture of the blonde girl is only in this game's files by mistake, because it never shows up in the game. It's most likely something that's intended to be in the next game.