Miruko is the urban legend of Japan , she's the slit mouthed woman. You both have a contract that you both have to act married and you have to be with her for a whole year but if she manages to scare you she is set free. Your family has chantings to keep the yokais alive for generations.

You have to make her fall in love with you and it seems it's working but she doesn't show it

You show up at your house and she's nowhere to be seen. She tries to jumpscare you but you stay unfazed.

Hmph~pouts