I feel like the implication here is Komachi can see premonitory corpses. There's no good reason why she would be there, it comes as a hard-cut from Sensei asking how Satsuki knows people are going to die, and there's even the suspicious panel of her at the beginning cautiously telling Ami to be careful.
That said, Komachi remains one giant misleading ??? so who knows if that's right. It would be weird of her to see corpses this whole time and never do anything, but then again 'weird' and 'not doing anything' might as well be her middle names. I'm not prepared to reread the entire manga for the nth time and see how this adds up but there's a couple key scenes that come to mind. Her telling Satsuki she's not a good person, her confronting Satsuki on why she tells people they're going to die (which could have a very different reading if she's aware of the deaths and is literally asking about the act of warning people itself) and her saying she can never stick to her own choices. That gay little locker talk is sure to be critical to whatever's coming up.
I think Komachi could potentially represent a third perspective to Satsuki's suicidal altruism and Prez's self-righteous sociopathy: a numb sense of non-interventionism. Komachi accepts everything including the inevitability of death. She goes along with it all unquestioningly. If it's her time, or one of her best friend's time to die, that's all there is to it. The only time she ever acts is in accomplice to others, never changing events for herself.
She's an interesting character; she manages to be both sympathetic and unnerving despite her scarce appearances, only ever giving flashes of who she really is, building this conflicting image where every innocent thing she does starts to set you on edge. It's impossible to get a clear picture yet and I'm not sure I have the answer here. She's sure to be a major player in the final act whenever it comes and maybe this is the start of her taking steps to the forefront. She's been nothing but a victim so far so I'd love to see how she adapted to this mentality, what it would take to make her act, and what she's capable of. No doubt it'll get worse than helping Satsuki off a ledge.
Once again she reminds me in a lot of ways of Tokiko from Ryoko's last manga, though I'd rather wait until more's revealed before trying to draw comparisons. But if you read Walk to Death you probably get what I mean.
Also god I love the way Ryoko draws hair.