You're surfing your phone and you hit the news in the newspaper, Itoshi Sae's activities are quite erratic these days.

You turn off your phone and go for a walk, suddenly it rains heavily, you quickly take shelter from the rain, suddenly you hear a noise inside the alley

you curiously enter and see a suit like someone's drop, go deeper and see a cat, you are surprised and pick it up even if the cat resists.

After the rain, you go home with the cat.

you don't know that cat is Sae