Nana arrives late to the latest murder scene with Detective Kyouya already working the case. He questions those in the adjacent room: Muguo and three acolytes, whose talents are voice mimicry, astral projection, and magnetism. They apparently didn’t hear a struggle in the Ryuuji’s room last night.
Ryuuji’s girlfriend, Sorano Fuuko, is the most suspicious to us because she’s in the opening credits and also just framed suspiciously. Fuuko demonstrates her power to focus atmosphere into a powerful weapon on a willing (and invincible) Kyouya. She does it outside because she finds it hard to focus in a closed interior space.
After the demo, Kyouya goes off to ponder, while Nana checks out the crime scene. If Fuuko needed air, that explains the open window and bugs that got in the dorm, as well as the messy state of the place. Michiru tags along, and Nana senses something has been off about her since last night.
Nana is also surprised to find she can’t hold back her emotions when Michiru thoughtlessly talks about how great her parents are when Nana told her about her parents’ fate the previous night. The fatigue could well be getting to them both, but then Nana thinks she’s figured out the reason for Nana’s off-ness when the teacher comes by with a fresh uniform.
Kyouya told him to deliver it, and Nana recalls she had a bottle of poison in it. Thus she suspects Michiru is off because she found it, and like the incriminating photo of her, is torn between their genuine friendship and suspicions of her own.
When Kyouya suddenly appears, her fears seem to be confirmed, but the detective only wants Nana to accompany him for an interview with Fuuko, hoping her mind-reading will help him determine if Fuuko is telling the truth. Interestingly, at no point during their time with Fuuko does Nana consider this is why Kyouya brought her.
When he asks about Fuuko’s thoughts, Nana tells the truth: she wasn’t focused enough, but for what it’s worth, she doesn’t think Fuuko did it…yet. But when Kyouya starts piecing together the night of the murder in intricate detail, he ends up starting to convince her that it could be Fuuko. It’s great procedural stuff.
That brings Nana back to Michiru’s, as she didn’t like where they left things the last time they were together (Nana yelled at her and stormed off). Michiru is in the shower, so Nana searches her dorm for the poison. Instead, she finds Michiru’s open journal, which is full of beautifully pure, earnest entries about how much she loves and admires Nana.
I should know better considering her conditioning prior to coming to the island and, ya know, all the people she’s murdered, but Nana seems…chastened by this journal…even a little guilty for ever suspecting Michiru? No doubt those suspicions were somewhat influenced by Jin’s fake “Dark Michiru”.
Right on cue, Jin appears. Turns out he took the potion from Nana’s clothes before Michiru or Kyouya could find it. He’s determined to allow Nana to “keep swimming”, i.e. continue her mission until he can draw out more about the people she answers to.
Jin then forebodingly mentions how Michiru has been in the shower quite a long time, and takes his leave. Nana suddenly panics and rushes in the bath, where Michiru is slumped over the side of an overflowing tub. Could this be the end of dear, sweet Michiru? Was Nana snapping at her really their last interaction?
Something else to consider: Is this the act of the one who murdered Ryuuji, or did that last terse interaction drive Michiru to kill herself? We don’t know, and at the moment neither does Nana. From the first episode she’s prided herself on being on top of things with regard to who is up to what; it’s what any serial killer needs to be to avoid ending up caught or dead.
But at the moment Nana herself is a bit “off”—both unsure of the second murderer and morally conflicted vis-a-vis Michiru. It’s an intriguingly uncertain place for her to be with just two episodes remaining.