Kagamigami (カガミガミ, Kagamigami) is a Japanese manga series written and illustrated by Toshiaki Iwashiro. It's based on the Shikigami Twilight DaysIwashiro created in 2014.
Viz Media's digital magazine Weekly Shonen Jump announced on Monday that it will begin its next round of "Jump Start" series in its next issue on February 9 with Toshiaki Iwashiro's Kagamigami (Mirror God).
The manga, based on Iwashiro's one-shot which ran in Shonen Jump last year, will premiere in Japan on the same day. In the story, the "famous detective(!?)" Mako meets the mysterious boy Kyōsuke.

Sinopsis :
Kyousuke Kagami is a young shikigami user, who along with Hakutenmaru, a spirit fox, came to Tokyo to solve supernatural cases. There they met Mako, a young girl aiming to become great detective. As they solve a supernatural case together, Mako decides to stick with them, hoping that will help with her detective career.