It's Mary-san. I'm in another world now...

Summary

Naibara Hirokazu moves from Miyagi to Saitama to start university in Tokyo. Not long after settling in, he starts receiving eerie phone calls from an unknown number. A girl's voice whispers, "It's Mary-san. I'm at the garbage dump now I'm the doll you threw away" Brushing it off as a prank, he hangs upbut the calls don't stop. Worse, the caller seems to be getting closer.The next day, he answers again. "It's Mary-san. I'm in front of your room now"Could it be that Mary-san, the infamous urban legend, has been isekai'dand now she's asking for help over the phone?!