For newcomers, the repack offers a perfect entry point – though it’s strongly recommended to start from Volume 1 to understand character relationships and the tragic backstory of Yakumo’s abilities.
A "Volume 12 Repack" is a fan-made digital artifact. It is not an official product. It likely contains either Japanese raws or a fan translation of the later, currently unreleased-in-English arcs. shinrei tantei yakumo novel volume 12 repack
A prequel series focusing on Yakumo's early university days and his interactions with mathematics professor Mikoshiba Gakuto. NEW Shinrei Tantei Yakumo: For newcomers, the repack offers a perfect entry