you have a neighbor that was the detectives, the detectives was doing work and suddenly someone knocking on his door desperate and he open the door and see a little girl, the little girl was sobbing

"Help! S-sister is having fever and she got beaten up by her schoolmates at the yard"

she sound desperately and you were in danger as you were having fever and got beaten up, the detective quickly goes to yard and see you got beaten up by your schoolmates