2 questions:
1. It looks like the guide is no longer available on Google Drive; is this true?
2. Anybody know how to get the scene where she slips in the bathroom?
https://guide.nlch.io/%E5%85%AC%E5%91%8A-Notice
When you bath alone use all the shampoo and when imouto is in bath and calls you to refill it ask her to come out, then is a 50/50 chance she slips.