Probably gonna drop after this one resolved. I was expecting some clever and badass revenge but all I get is cheap dramaqueen that prolonged into several chapter
Miyo is a ghost, She told Ryu that her head was cut off there (by mistake?) And so that's why Ryu goes there with Miyo and found other heads that was cut off (by mistake).
The place was probably abandoned hospital where some malpractice happened, or maybe dark magic experiment idk.