Mannequins seem a bit lazy, unless there’s a ghost story known by Sorawo that ties into mannequins at a hot spring resort. I guess they were in an interstitial space, but it’s definitely odd that they woke up in their bed, that implies they were both in the space by the time they woke up and went to the hot spring.
While its unclear if the Otherside is entity (or a group of entities) with its own goals and intent, there has been a pattern of it seemingly responding to the characters' mental state when it contacts them. So I'd like to ask everyone to consider that the girls were pulled into a nightmare about mannequins (naked bodies) in the interstitial space, right after Toriko made it abundantly clear that she is sexually attracted to Sorawo's naked body, and think about what that might say about Sorawo.
When one looks past the memes about Sorawo being a "useless lesbian", and the fact that the author takes inspiration from scary stories shared on 2Chan in the 2000s, one might find that this story is also about about the characters' internal struggles, and the author isn't just slapping a random creepypasta in each arc without a deeper meaning.
I'm not trying to flaunt my intellect here, I'm just a bit bummed out when I see people read Otherside Picnic without looking past the surface level, and then dismiss developments as random or illogical.
We ain't getting back to that level of progress until 30 chapters later I'll bet
(Tbc: I'm trying to respond to all the comments with a similar sentiment, not you specifically.)
On one hand, the option to read ahead is always there. The novels are available in English; they are excellently written and translated (I have read some of the popular yuri LN's available in English - the quality of the prose in Otherside Picnic is in a different category). You will be able to engage with this story the way it was originally intended, and I guarantee that pacing and lack of romantic progress will no longer be an issue! (Not counting vol. 4 which the manga is currently in, there are four more volumes that you can read right now.) There has never been a better time to catch up than now; I honestly envy anybody who gets to read those eight volumes back to back for the first time.
On the other hand, I don't think this reaction is fair even without reading ahead. Sorawo being forced to reckon with how Toriko feels about her has been a consistent theme since Toriko's first "I love you" (after they escaped from Satsuki at the end of the cultist arc).
In the next file ('The Matter At That Farm'), Toriko escalates their intimacy to holding hands, and Sorawo reacts the worst possible way ("you are acting like my boyfriend"), but emboldens Toriko with promises of playing together in the Otherside. The Otherside, as if Sorawo's relief about Toriko finally giving up on Satsuki prompted a change in tactics, "contacts" the two through ghosts of Sorawo's troubled past (father and grandmother). This is followed up on in the next file ('Pandora in the Next Room'), where Sorawo avoids sharing the relevant parts of her backstory with Toriko by avoiding her altogether, but it still leads to a milestone in their relationship (Toriko's first stay at Sorawo's place). And now in this file, Toriko tries to escalate further, and they are "conveniently" interrupted, but if you consider what they are interrupted by, it doesn't seem that random or convenient. In the novel, all of this takes place within the same book!
What I'm trying to get at here is something that becomes fairly obvious when reading this volume of the novels, but easily gets lost between waiting for each chapter of the manga adaptation. Even if you're a manga-only reader, if you take a step back, you may realize that the series has been a coming-of-age narrative from the start, where Sorawo's character crystallizes as a genuinely troubled girl on a journey of processing her trauma and repairing her severely damaged connection to humanity. With that in mind, the idea that Sorawo is a "useless lesbian" whose romantic "progress" is always thwarted arbitrarily by the forces of the plot, is something you should be seriously questioning at this point.