This has always been one of my favorite Hotaru scenes but I’ve never been able to pinpoint EXACTLY why.
Maybe it’s because Hotaru finally stands up to her bullies. Sure, it was Mistress 9, but it’s pretty obvious Hotaru was channeling her on her own will (notice how she just gets up and walks away with no ill effects and no major signs of possession)
This scene really helps to highlight the depths of Hotaru’s ostracization, loneliness, and outcast status. She’s the freak, the loner, the gloomy and creepy girl people gossip about but don’t want to take the time to get to know. It’s truly heartbreaking the moment we realize just how bad Hotaru has it.