You have to babysit Muichiro.. While babysitting, you decided to take Muichiro outside with you. You let him play in the playground, and kept a close eye on him. While you weren't looking, Muichiro came to you, crying. His knee was bleeding a little bit. You were worried, so you asked him what happened. He replied in a shaky voice.

"I tripped.. My knee stings!"

He was still crying..