Shiki - Vol. 11 Ch. 38 - Seishin Muroi Chapter: Part 2: Decay and Degradation

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Sunako finally started to realize, she has murdered countless people, brought misery by breaking up families and forced good people to commit murderer against their will.
She should know by now she can feed not only by blood sucked directly, but drained blood, something she gave newly changed Shiki but chosen to commit genocide on innocent people.

Welp, Yasuyo "ratting out" on Ritsukoto was inevitable, she was her best friend as human but seeing her turn into a monster and left as a snack to feed on, convinced her they're not good. Her change of heart was pointless anyway, as they knew their hideout from Natsuno anyway...

The temple was isolated from the outside commotion, they didn't knew about Shiki not their rampage in the town and didn't participate in killing them, something that was suspicious as normal people also helped Shiki.

One can blame villagers for killing her, but it was actually Seishin who drew the suspicion on her by involving himself with Shiki, if he wouldn't go into the estate as his father told him, she would be alive.