Well, I've started playing version 0.2, and I have to agree with what was said in the previous comment. The dialogue is really hard to read, and that's mainly due to the super long sentences without any punctuation. And even the short sentences could use a comma here and there.
I then tried to fix that by editing the rpy files in my copy. That's the next point, because it's not necessary to limit each line of source code to 80 or so characters and continue on the next line.
Also, the next text that a certain character says (or thinks), the character variable must precede the dialogue text.
Then, a very common habit I see in many Renpy source texts is the misuse of jump statements that just lead to the next executed line. These jumps could either be omitted completely or replaced by a pass statement, e.g. to simply leave the menu option empty.
Okay, the last one for today. There is the possibility to increment the variable Saeko_A infinitely by always choosing the first option during the shower play without ending it. I would recommend placing the increment statement after the label jay_finger_saeko_anus and also include it in an if-clause like "if Saeko_A == 0:". This way it could only be incremented by 1 in this situation.
I'm off to place more commas and full stops. :)