So very much horror happening here.
First horror: Sensei is trying desperately to be the best protector and ally Kaya can have, because her precious student is in a BAD family situation, and is likewise desperately reaching out to others who seem to have the same goals.
Second horror: Ebisumori family has been doing some pretty heinous shit for generations to their eldest daughters.
Third horror: Kaya's Mom has doubled the amount of heinous shit, doing heavens knows what to her born and unborn children in the process, out of spite for her sister.
Fourth horror: whatever the fuck happened outside the hospital room. JFC, that was chilling.
Fifth horror: As demonstrated by Grandma Ebisumori, good intentions are NOT going to be enough to deal with whatever hell Mom has called forth into the world.