I've found that if/when it does that, if you click on your room and sleep it will move the game along. TBH thats the only way I could move forward from that scene - every other place I clicked showed incorrect images and/or image of the sister.
There's a 100% preventable rape scene... that is why you see 2 guys with the same girl. The 1 screen is of the rape scene (the fat guy standing), while the other scene is of the MC with the girl.
For those concerned - the rape incident happens if you follow that particular girls story, however you have multiple prompt's to stop it. If you let it happen, you lose access to the girl as she no longer shows up at school or answers her door, and considering the storyline that's 100% understandable imo.
For those who want to see the scene (I've seen some mention it), but are having issues (technical issues, or just strugglign with the translation... which is def an issue), here's a save right at the start of the scene.