yeah cause the entire truth is kinda a big twist and might feel like a giant asspull
Yuri hit Tsukushi cause he was being kinda pervy around and she was on her way to see her crush who had just died that she was very tsundere with in public (it was the detective guy). She hit him reflexively but then wiped her memory of that incident and fainted because her mind didn't want her to process her doing something she'd consider a crime, especially against her precious brother. The investigation and reason for MC's reincarnation was because of Yuri's wish afterwards.