"This is a Tokarev. A gun once used by the Soviet military and which has gotten pretty popular in the Japanese underground. It's exactly the sort of weapon the Sumaderas might be using. ...Also, having Sumadera Kasumi die would be convenient for the Sumadera family as well. They could have leaked...no, exchanged information on their end as well. Therefore, it's possible that you knew beforehand that the Sumadera hit men would be using Tokarevs."