One day, my younger sister Akane's friend Mika had come over to play. After they'd been hanging out in my sister's room for a while, Akane rushed out of the room in a hurry. Akane: "Sorry! Something urgent just came up, so please take care of Mika until I get back!"

When I went to the room, my sister's friend Mika was sitting there reading a book.

When Mika stood up to put the book back on the shelf, she accidentally tripped, and as I tried to catch her, we both tumbled onto the bed.