The April 2016 issue of Young Ace
magazine, which will publish the final chapter of Kei Sanbe
's mystery manga Boku dake ga Inai Machi
, has announced that the series will begin a spin-off serialization.
Tentatively titled Boku dake ga Inai Machi Gaiden
, the new series will begin publishing in the July 2016 issue of Young Ace, which will go on sale on June 4. According to the magazine announcement, Boku dake ga Inai Machi Gaiden
will tell additional stories which were not explored in the main series.
The eighth and final volume of Boku dake ga Inai Machi
will go on sale on May 2. The currently airing TV anime
adaptation was previously announced to adapt the entirety of the manga's story.
Source: Comic Natalie
Boku dake ga Inai Machi Gaiden