Kenshi Ito had always believed that the killer of his younger brother was the Destroyer. However, after the truth that the Destroyer was actually Yan Fei's alias came to light, he redirected his hatred toward Yan Fei. When Kenshi Ito was recruited by the Japanese Government, he gained access to more detailed information regarding his brother's death at Yan Fei's hands. It included a revelation that Koseki Ito had been trying to protect Ryoko Oogawa, but at the critical moment, Ryoko Oogawa shoved Koseki Ito to the ground in order to save herself, using him to delay Yan Fei's pursuit of her.
Even if Ryoko Oogawa hadn't shoved Koseki Ito to the ground, the two of them still wouldn't have escaped Yan Fei's relentless pursuit. But after learning this detail, Kenshi Ito immediately defined his brother's killers as two people: the first, naturally, was Yan Fei, while the second was Ryoko Oogawa from the Oogawa Family.
