Official English: INKR In this world, humanity has been driven underground to live like moles, hiding from the fearsome monsters which roam the surface. The monsters are impervious to every sort of weapon k...

Yousuke and his sister were orphaned at a young age. Yousuke's sister was adopted ten years before the start of the story, since then, he has been looking for her. One day Yousuke found the couple that adop...