"You don't need math for murder" - Miharu S.

Raizou Hiraga is a retired officer from the Tokyo Metropolitan Police Department.
After learning that his grandson is stricken with a deadly illness requiring expensive treatment,
Raizou comes across a vacancy flier for the mysterious SS Agency and applies for the job.
However, after taking his first job with 11-year-old Miharu Suzukaze as partner, he discovers
that his new occupation is more than meets the eye…