Keiichi! Call them! Don't be a hero! Don't make things worse by getting personally and directly involved. Unless you're adopting her. Then that's okay.
Yes, Keiichi, talk to your parents about the situation!
'Calm down, Keiichi, and realize you can't talk to your parents.' NO KEIICHI! DON'T LISTEN TO YOURSELF! You're putting the cart before the horse, overthinking everything until you do nothing. Take it from me! I am that guy! Don't do it! Open up, talk, and figure things out. Making huge assumptions, often in the negative, is BAD.
Keiichi thinks how hard it would be to add another place to their table of three... while there's a picture of a four-seated table in the background.
TALK KEIICHI! TAAAAAAAALLLLLLLLLLLK
*facepalm* I hate this game. It's like being chained up and watching a series of bad decisions you can't stop, and unlike passively watching a movie or a television show... I'm actively pressing the button to continue.
Keiichi has gone from maybe calling protective services because her uncle is more outwardly abusive than her aunt to... I'm going to secretly kidnap this younger girl to my room and not tell anyone. And the festival hasn't even happened yet.
They ganged up on you because you are making decision-faces at the table and you are NOT TALKING TO YOUR PARENTS
Tomitake! Both good and bad to see you! Oh the signs of bad times a-comin'...
And Miyo! Everyone with sprites has now shown up! Cue the death parade!
The curse is her life's work? Huh?
"All strange things should be explainable by human actions." Okay, so Miyo isn't a witch.
Keiichi can't talk to his parents, but he can sure as hell talk to Miyo and her serial killer stories
Whoa! A third part? And we jump past the conversation with Miyo? Keiichi! Don't be an unreliable and suspicious narrator!!!
No comment on anything at school. That was tough, and I';m glad Keiichi spoke up.
Those TIPS were tough, too... ;_;
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"In my headcanon, some staffer saw Trump pull out his phone and start typing so they just Terry Tate Office Linebacker'd him out of his shoes." - FFD