Ren is a royal member of the Vampire Clan and abhors great resentment towards Zeldris.

Twelve years ago, a messenger of a neighboring country of Lioness—Edinburgh—announced that there were vampires. The inhabitants of Edinburgh were either killed or transformed into vampires, and so the capital was taken from them. The captain of the holy knights Zaratras, Dreyfus, Hendricksen, and Meliodas made a conference between the leaders, where it was decided to form the group of riders: "Seven Deadly Sins", who are tasked to recapture Edinburgh.

This book collects new Seven Deadly Sins stories with the characters you love, by original creator Nakaba Suzuki, along with the original “pilot” manga that developed into the global hit.
 
(Source: Kodansha USA)
 
Collects: 
1-3) The Vampire of Edinburgh (Edinburgh no Kyuuketsuki / エジンバラの吸血鬼) 
4) A Dangerous Mission ♥ (Kiken na Otsukai / キケンなお使い) 
5) "The Seven Deadly Sins" - Pilot Story (Yomikiri-ban: Nanatsu no Taizai / 読み切り版 七つの大罪)