Span in the time of naruto 446 story of ready to fight yahiko. The manga discussion after some picture raw out can read online discussion by semaka say: "The kunai was in Nagato's right hand, so that means, Nagato was ready to fight Yahiko And Yahiko probably didn't want to fight him, and it looks like he grabs Nagato's right hand that holds the kunai, and stabs himself. So, the blood was on Nagato's hand." Resource and review naruto manga 446 enjot with news here.
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