Officer Sato smacked a fist into her palm and understood. "When he stabbed himself, he was holding it in a reverse grip. There's no reason he'd suddenly switch to a forward grip when pulling the knife out... Looks like Jiang Xia was right. After Takagi left, someone else came here, stabbed Chizo Ogura to death, then tossed the knife aside to try to fake a suicide scene."
Officer Takagi scratched his head, though. He still felt like something was not right. "But before I left, I clearly saw Chizo Ogura stab himself in the stomach. Blood was pouring out, and just like Officer Sato said just now, there was only one knife wound on his body..."
Jiang Xia pointed at Chizo Ogura's right hand, which hung at his side. "Look. The hand he used to hold the knife is still dripping blood. But the blood splashed on the floor, and the blood on the knife, are obviously much thicker."
"Hm?" Officer Sato approached and looked at Chizo Ogura's hand. Sure enough, the more she looked, the more unusual it seemed. "This blood is so strange. It flows far too easily... Wait, could heparin have been added to it?"
Heparin was a well-known anticoagulant with broad applications, and it could take effect both inside and outside the body.
Having noticed this point, the truth seemed close at hand. Officer Sato, like Jiang Xia, touched her chin and pondered. "After blood leaves the body, if it isn't stored properly, it'll clot very quickly. At a time like that, if heparin is mixed in, it can maintain its liquid form—in other words, the blood on Chizo Ogura's hand very likely wasn't his own, but was deliberately brought onto the train by someone. That person should be the culprit who killed him."
Jiang Xia