An original story included with volume 10 of the Nakanohito Genome [Jikkyouchuu] manga.

Unaired episodes included with the Blu-ray and DVD release of Nanatsu no Bitoku.

Nanako is a an inept apprentice nurse to the brilliant young Dr. Kouji. Now for some reason, Nanako is always being targeted by various elements which makes Nanako wonder if she has done anything wrong. But there are certain secrets to Nanako's past that only Dr. Kouji and his family know about.

Set in the same timeline as Sin: Nanatsu no Taizai, Nanatsu no Bitoku follows a group of angels sent from Heaven to look for a potential Savior to counter-attack the demonic influence being spread by Lucifer and the other emissaries of Hell. (Source: Tokyo Zerostar)