This reminds me of a murder incident involving a "yami baito" group in Japan. These groups recruit people to do home robberies and other crimes through social media and they're becoming more common. Tanaka's grandma and Asura's mom might have been victims of a yami baito group who we'll see get...
I remember reading predictions either here on 4chan's /a/ that the girl in the beginning of ch.1 wasn't Nagi, but actually Chako since she slimmed down. Looking at ch. 1 again and that seems to have been correct. Nice job.