I don't get it, when did shovel-girl die? We saw her sleep next to kouhai-kun, even got a flashback between kouhai and shovel just before she woke up with her still next to her, and hat-chan about to head out after prez-prez. But when hat-chan faltered outside kurumi was suddenly dead (hat-chan hallucinated her, and so far everyone she has hallucinated has been dead, meaning she has a psychological trigger to not make up ppl she thinks is alive (to limit inconsistencies?))?
Honestly, all the last few chapters has confused me greatly, although most of it has easily been attributed to hat-chan losing her hat. The manga would have been improved if the author, publisher, or scanlators had painted/marked hatless-hat-chan with some colored "marker-pen" in all panels she appears :/
edit: also, what was with that 'i am here' thing? I assume it is a reference to something, but it felt very out of place coming after she was asked to expound on the water-thing. It is also why they didn't find out which river she meant (one near a school, likely where they lost contact with the team. but which one exactly? they dont know which river is feeding its system), and I assume this is likely going to make them decide to drop a bomb anyway instead of search every river in the area.