Chapter 5 is supposed to be the dark route, so it would make sense to center it around a character who is either integral to it, or would suffer the most because of it.
Ami would fit, but she has already been used. Sekai could be a contender.
Ultimately though, I'm not sure how significant it would be. As others have pointed out, Sana hasn't had that much screen time so far, she isn't part of the RAS either.
From Selebus' point of view, I could even understand having trouble in picking one specific character for a whole chapter. Although, I have to say, so far I would actually pick Yumi over anyone like Sana, even Sekai has been more integral so far with how much we learned about her and how often she showed up.
But maybe Yumi (or Sekai) will indeed have an even bigger impact on the overall plot in Chapter 5 and she hasn't been picked for Chapter 4 for that exact reason.
I don't think it was Nodokers that was killed, I think it was Himawari. She didn't say things the way Nodoka would say. We saw how Himawari was trying to "save" Nodoka, I think that is part of it, and Ami needs Nodokers to figure something out so she is mad that Himawari is trying to interfere.
I'm thinking Yumi cos all of the chapter cover girls have been from floor 1 so far and of the remaining girls, she seems to be the most important atm, with her being involved in the happy events from the start and now becoming aware of the resets
As much as I like Yumi and as much I want her to be the next chapter main girl... I believe it might be Makoto. Why? Well, she was in the RAS for a long time now and she didn't have a huge impact in the story so far. BUT! We should understand the logic behind the chapter covers first!
I would say chapter 2 was really Maya's chapter. Just like chapter 3 was Ayane's chapter. We can say Ami was the cover girl for chapter 1 because she was the first girl we saw and we spent a lot of time with her (but I don't remember anything at this point).
So... So why did Sana become the cover girl for chapter 4? Well... I can assume she had a lot of screen time at the beginning of the chapter.... But now most of her events are about being horny and..... and that's it. But all I can say now is... we have to wait for more events with Sana to make us all fall in love with this little ogre.
But let's forget about Sana for now and try to understand why these three girls became the cover girls. We know that all three of them can remember resets and loops. And I think they became the cover girls in the order in which they realized they were in a time loop. However, if that's the case, then the fourth girl should be Makoto, not Sana. Unless there's some other reason we don't know about.
Maybe it has something to do with who Sensei fell in love with first. But then again, Sensei did fall in love with Makoto before he fell in love with Sana, whom he hasn't even expressed his feelings for yet. But if we take the opposite idea as a starting point... For example, if they were in order based on who fell in love with Sensei first, that theory would have a better chance of being true. However, we now have a problem not only with Makoto, but also with Chika and Noriko and the other girls who love Sensei for a long time.
Of course, Selebus can show us a middle finger and tell that Sana was in love with Akira for many years now, so that's why she is here. Alas, Noriko is still a problem here. And if we include the tinfoil theory about Yumi and Akira having some sorta relationship far in the past cycles... Well, I think more and more that 4th chapter is actually Yumi's chapter, xddd
I can't remember exactly but I think you just click the screen a few times to progress. You might want to check the puzzle guide on page 1 of this thread.
Yumi's definitely main girl for chapter material. I mean, she always was, but evidence just piles up, and now even HOPE has said so.
Edit: I don't know if HOPE's talking about Akira or Maya here, could be either. Depending on the answer, it changes what he intends to want them (Ayane and Yumi) for.
So... So why did Sana become the cover girl for chapter 4? Well... I can assume she had a lot of screen time at the beginning of the chapter.... But now most of her events are about being horny and..... and that's it.
Overall, this chapter was much more about Ami, Pareidolia, even Himawari - and, more than anything, Sekai. Granted, none of these qualify for chapter poster girl. But still... I'll entertain a theory on how it could make sense for it to be Sana's chapter though:
I mean, all of this could be sort of understandable if Sana and Sara are important because they were toyed with by Nozomu. We couldn't really delve into that story when Maya and Sekai's story, especially Sekai's, was in the dark. So what we saw up until the first spring reset was setup for the Arakawa family (including Sana). Basically set up/backstory that was necessary before it could be revealed that she's an Arakawa.
Overall, this chapter was much more about Ami, Pareidolia, even Himawari - and, more than anything, Sekai. Granted, none of these qualify for chapter poster girl. But still... I'll entertain a theory on how it could make sense for it to be Sana's chapter though:
I mean, all of this could be sort of understandable if Sana and Sara are important because they were toyed with by Nozomu. We couldn't really delve into that story when Maya and Sekai's story, especially Sekai's, was in the dark. So what we saw up until the first spring reset was setup for the Arakawa family (including Sana). Basically set up/backstory that was necessary before it could be revealed that she's an Arakawa.
This is especially spicy, it would make Akira and Sana half-siblings.
Does it really work though? Do we have enough information about Nozomu and Saki to even tell whether they could have had a child with each other? I also had the impression that Nozomu wasn't that much older than him, unless I forgot it being mentioned somewhere?