The spoils of war were already laid out on the table, so it wasn't right to keep them all to oneself.
Moreover, frankly speaking, converting this operation's contribution points into rewards from the spoils of war wasn't a bad deal.
If Kamiyagawa had independently subdued the Earthquake Catfish and killed that Arajin, the Key Stone would definitely have been his, but there wouldn't have been any other gains. But by collaborating with the Countermeasures Office, not only could he take a piece of Key Stone, but there was also a cash reward afterward.
Thinking about it, did he actually come out ahead?
"Alright, then I'll take a look at that Key Stone."
"Hmm, if you want it, just let me know, complete the formalities, and it can be transferred to you in a few days."
Afterward, Kamiya checked out the Key Stone left behind by the Earthquake Catfish and felt that it indeed had a compatibility with the Huajing, which also belonged to the water element.