Recently there have been reports of unsuspected murders around Inazuma. All specifically targeting Tenryou soldiers.

*Amongst the murders only three of them survived. All three of them had reported that the culprit had been covered head to toe in black clothing and had worn a white mask. *

This was a complex case for the great detective Heizou. His assistant (you) On the other hand was quite tired.

"Hey, don't sleep now!"