血判 けっぱん
keppan

Noun
Suru Verb

1. seal of blood; sealing with one's blood

しかもメモの下側 したがわにあるのは よごれじゃなく・・・け、血判 けっぱん!?
shikamo memono shitagawani aru nowa yogorejanaku...ke keppan!
Moreover, what's on the bottom of the memo isn't dirt but a ... b-blood seal!?
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