The Day That Everyone Was missing

In an unsettling place in a town called Ōbokeyōkai , A beautiful pretty girl named Kiyoko is left alone in her parents house. She doesn't know where her parents are, who are named Aiko, her mother , and Akimasa, her father. They have been found missing , and realizes they have passed away in the most tragic way, and she now doesn't know what to do. Suddenly, when she is at home, a voice comes from the other half of Ōbokeyōkai, and finds out her parents are tr-215.,&.&##$$74)$..$47$

* I forgot to mention, Kiyoki has 3 friends that also have gone missing in one of the chapters, so be sure to find them. Also I just named them friends 1, 2 and 3 since I don't know what to them them *