Stories about traveling to “the other side” include Stranger Things (The Upside Down) and Neil Gaiman’s Coraline. The Girl from the Other Side is fantasy, involving two kingdoms; it appears to be dark fantasy, richly atmospheric, with an increasing sense of foreboding regarding—again, as in the above stories--a vulnerable little girl in peril. This volume largely features the relationship between young Shiva and (seemingly? in appearance only? demonic) Teacher. He appears to be her protector and advocate, and we hope this continues. See that amazing cover art? That’s the weird bird creature Teacher.
But fantasy bleeds toward horror in that The Outsider touches Shiva in her sleep, and could this make Shiva an Outsider, too? And then the Outsider is decapitated (sorry for the light spoiler, but you wanted to know that the creepy Outsider would have to carry his head around, if he’s scary and possibly bad, and would have to pay for his possible badness, right?), so that qualifies as horror, right? The impact of this manga gets largely carried by the darkly beautiful pen and ink art, where atmosphere dominates explanation, where some macabre world-building is still going on at the expense of plot clarity, but now I’m in, so I‘ll be patient.