I don't know if this is completed already, cause the last chapter at the last panel seems like an ending note. Maybe not? or Idk, they say it only has 1 volume so I'm not sure. Cause for me, though they achieve their 'love' they didn't really make much progress in the case except finding who's the root. So yah, hope it update so I'll know. But overall, It's GREAT! Thank you!
Norainu no Yoru