So... she convinces with no questions asked the girl holding evidence she is behind all these murders that the picture is a fake... by doing nothing essentially, just says the guys power had weakened and wasn't fully legit... i mean, wow.
But anyway, she tried to do everything including stopping the Necromancer making the corpse talk in front of everyone and no one bats a eye lid? really?
no suspicious activity on Nana at all.
But Kyouya (i think that is his name) finds her spying up her next target, well just a night stroll, no coincidences about her targeting them, but he did make the remark that the killer would want rid of the necromancer next... To Nana, using your brain and maybe thinking a little is far to beyond reason, so continues her mission, despite if you ask me it would of confirmed she is the killer to anyone (knowing she refused to use the Necromancer and they conveniently die after meeting her... just like everyone she spends a day with...)
But hey ho, the hulk girl played a nasty trick (first sign of intelligence in this show) and did the whole switcher-o with powers, pretending she is the hulk when it the was boy all along, well played, Nana tried to kill a corpse. So here is her chance, this hulk kid is literally keeping her pinned, if his strength is the real deal she isn't gonna move, she caught her in the act, needles and all... so why not instantly tell everyone? nah, makes too much sense. Even if no one believed her (i guarantee the guy would) this will make it much harder to kill anyone (especially Yuka was it?) as people would suspect her, she could also dispose of the needles giving Nana one less tool, equally, the healer would hopefully have reason to believe maybe (instead of being a moron) that the not at all suspicious photo might just, and i know this sounds crazy but it maybe just might of been true...
I mean it is just dumb now. She doesn't hide every episode she gets close to someone and that person vanishes within the coming days, she is terrible at covering her tracks and yet every student just lets her and turns ablind eye, the only ones who don't are so stupid they can't see a pattern in everyone she befriends dies, the fact she is always at the scene of the crime, the fact she is found stalking the people before they vanish, her wanting a list of everyone's powers (who some until now never mentioned before)... nah nothing out of place
So here's to next episode where Yuka will be killed by the wire/chain so fortunately under her bed (gotta keep these things handy for Nana) and because no one knows the boy is dead anyways, that's another to the list, could it be weird Nana was desperate for them to not let the corpse speak and then needed them dead and gone quick? nope, not at all... any if anyone even thinks it is suspicious yet another friend of hers she made within the day dies... well you would be out right crazy to think such a thing, please don't use logic, this show doesn't like intelligence... even that of a infant would be asking questions by this point.
