Vermillion
By: SATOH Atsuki
Genre: Action, Seinen, Supernatural
Publisher: Young Ace (Kadokawa)
Mangaupdates

By using the Dark Gate, humans can entrust their hopes and needs to the darkness. The darkness they call upon is a great and evil power, known as "Demon." With the help of his partner Miroku, the demon slayer Kisaki Senju will slaughter every last "demon" that is called into existence.