Everyone: OMG I love the story!
Me: ... I'm confused, didn't understand a single thing. Does this have something to do with Japanese customs?
Assuming this reply was directed at me, maybe I can make my point a little finer. I do think there is something in the layout of Nishio Yuhta's art that makes the details of the plot unclear on first read. This boils down to choices Nishio makes about the size and shape of panels, where Nishio chooses to place the "camera"––i.e., our perspective on the individual panels––and how Nishio uses flats, hatching and tone.
A lot of those choices and their sometimes negative effects can be seen in the spread on pages 20-21. The lion's share of the spread is taken up with the one panel, where Mizuno enters the restroom. We see the chief bully and her two accomplices, but not the subject of the bullying. I get that Nishio is saving Chayama's reveal for later, and that makes sense, but the parts of this composition that immediately draw your eye––because they get the most real estate and contract on the page––are the face of the chief bully and the body of the bully who's kicking the restroom stall. On first glance, it gives the impression that the bully kicking the stall is the one doing the bullying in the scene. The aerosol can that is the direct source of the bullying is actually obscured behind the bully with the mask's leg––her whole arm is hidden from our vantage point, so when Nishio cuts to a close-up in the next panel, the aerosol can, along with the hand holding it, aren't clearly assigned to any character in the previous panel. The girl with the mask is also blocking the hole they're using to spray the aerosol with her shoe. When I zoom in close I see sound effects trying to compensate for this––the girl with the mask is shaking the can, presumably. And then the smaller close-up panel on the left side of the spread is much less readable. It's hard to know what to focus on in that panel. The foot kicking the door seems to be the through-line from the previous panel; the aerosol can and the hand holding are things we didn't see previously. To be really clear what I'm suggesting here, I think if Nishio had shown the girl with the mask visibly shaking the aerosol can in the larger first panel, the action in the second panel would have been much clearer. Even so, there is the scream, "Cut it out," which is unattributed on the page. Looking at the next page, I can sort of assume Mizuno has shouted this, but even with the context of the second page, it isn't very clear she's done so.
Also, because Nishio chooses to use hatching and tone primarily as a realistic lighting effect, that texture usually doesn't help to read the story action on the page. On the pg. 20-21 spread, for instance, the aerosol can could have been surrounded by tone, haloing it and calling it out as the focus of the panel composition. As it is, the more dynamic foot banging on the stall grabs attention, with it's pose, effects, and action lines. The speech bubble in the center takes up a lot of space as well, and competes for narrative attention, since we don't know who's speaking yet. The ultimate effect is that the impact of the actual bullying is dulled considerably by other visual elements competing for our attention. The girl making all the noise isn't the primary bully of the scene, and understanding her actions won't make the bullying more visually clear. But she grabs a lot of visual attention on first read, and the masked girl with the aerosol can attracts less visual attention.
This is indicative of a common lack of follow-up on characters' actions and their changing moods from panel to panel, which makes Nishio's work hard to entirely get on the first read-through. There are similar issues of framing and choreography on pages 33, 34, and 36, where it's hard to tell what the characters are actually doing, or why they're doing...whatever it is they're doing. Certainly, I've been able to make more sense of it reading it through a second and third time, but the way I look at it is that the choreography and the angle of some of these compositions could be altered slightly, sharpened, and the whole scene would be more visually focused on the elements of the story the reader needs to get right away.
As far as the construction of the toilet stall being a peculiarly Japanese thing, what I meant was that I don't know of any such toilet stalls––even taller ones like you see in some schools in South Korea, for instance––that don't ventilate at the top. In order for this bullying trick to work––attempted murder, really, as macfluffers points out––the stall has to be sealable from floor to ceiling, and I've just not seen any toilet stalls where the door is built to ceiling height. Maybe that's common in Japanese school bathrooms? I've never been to Japan and so I don't know. I've never to my knowledge seen such a bathroom stall depicted in a Japanese film or manga. If the intent of that last comment ("Does this have something to do with Japanese customs?") was that I was being culturally insensitive, all I'm doing here is trying to foreground my own ignorance as one of the possible reasons I have a hard time interpreting this bullying scene. But again, Nishio never draws the entire stall, floor to ceiling, so I simply have to imagine the door extents all the way to the ceiling, and––culturally insensitive or not, though I prefer to think of it as culturally unaware––I would never assume that to be the case.
As for the common consensus on it being good, I don't object. I did enjoy this chapter, even though I had a lot of trouble visually unpacking the story. I liked the mood a lot, and the interesting feeling between the two girls. And I do like the art a lot––individual panels look great, the style of drawing characters is very rich and rewarding––when you see their faces in full, their expressions speak volumes. But I do think there is room to improve on Nishio's approach to choreographing his comics––arranging the the mis en scene, so to speak––for more immediate clarity. It's something less ambitious artists pull off more capably on a lot of other yuri manga. It's a pain to have to go back and re-read a chapter to understand what's going on, and it could be avoided if Nishio could visually edit his work to read more clearly at crucial junctures.