Just thought of something interesting. It feels like the deaths in Imawa no Michi are relative to when everyone entered their "near-death experience." I'm partly speculating, so bear with me. Yura was the first one to be put on the verge of death, just as he is the first one killed in the other world. Tomii was accidentally shot right after Yura, putting him on the verge of death, and with Tomii dying several days later. Briefly before the truck hits four individuals, the "team" consisting of Hayon, Ayon, Moro, Kimari, and Gamon are put into cardiac arrest; all five of them die right after one another, with Hayon dying first on the fifth day. With that all said, we're now left with the remaining four individuals who were hit by the truck and Kiina, who has been in a coma before all the other eleven individuals experienced near-death. I guess if you wanted to go ahead with this line of thought, you might even think of Kiina as a total anomaly.