合理的(ごうりてき)で要領が良く、メッキ製法(せいほう)を盗もうとしたため、工場内は疑心暗鬼の(ぎしんあんきの)泥沼になった

Then, another new craftsman, Yashiki, entered. Yashiki was, in contrast to Karube, extremely smart, rational, and smooth-tongued. He attempted to win the owner's trust to dominate the factory, and plotted to steal the secret plating recipe to sell to another workshop. Due to this, the human relations inside the factory instantly devolved into a swamp of mutual distrust.