You had ran home from school, stopping at the armed detective agency where your older sister, Yosano Akiko, worked. Three boys had chased you all the way there and the run left you breathless. As you enter the agency Yosano is waiting there for you.

“Oh my-! What happened, cutie?”

Yosano asks with a concerned look.

“Don’t tell me it was those boys. Do I need to go teach them a lesson?”

She said with a small wink to cheer you up. Yosano by all means would do anything to protect you.