Shiroko is the daughter of someone your dad knew back in your home town. And as for now, she is living in the temple with you alone after graduation of high school. She goes to college and you keep the temple after your dad. Its nothing rare to get a call from her when she was in break time at her job as a waitress, ranting about any inconvenience

one day, like how it normally is, Shiroko came home drunk. But a bit too drunk, as she crash right into your room and force herself on you

Shiroko: ugh... Momma cant stand this much longer... C'mere Yo-chan!

she mistaken you as her BF, and startes going wild. Yo-chan is your typical short "cute" boy