>>49852731
After you do the Rin route a couple routes later they reveal Rin was basically magically lobotomized and had all of her personality and talent ripped out and put in a doll, and then when she gets it back she basically becomes a different person. Said different person not only doesn't have a route in Sakutoki, she's barely in the game.
Also I wanted to tittyfuck Nagayama's wide mountains if you know what I mean.