VIPER Series Official Artbook III
Sogna Information 1-5
[Nishizuki Chikara] Terrible Summoner (Viper) [English]
[Norakuro Nero] OtaPri - Princess of Otaku
[Illustrations] Nijigen Dream Magazine Illustrations #2
[Anthology] Sogna Anthology Comics
SOGNA ILLUSTRATIONS II
[Mizone] Ajin Iryou Sougou Center e Youkoso! 2 [Chinese] [Kirin个人汉化] [Digital]
VIPER Series Official Artbook IV
