Night Blade (夜刀, Yato) is an old organization that has protected the order of the Hollow Night for years.
They protected the Night for ages, but then an internal struggle begun within the Night Blade and brought ruin to the organization. Some remains of its members still continue to fight Voids and protect the Night.
- Seth, descendant of a previous leader and a childhood friend of Linne and Kuon.
- Yuzuriha, descendant of an old members who betrayed the Night Blade.
- In Linne's arcade story she reveals that the true meaning behind the name is "The Sword which Bows Down the Hollow Night" (虚ろの夜に伏す刀)