Fukushuu wo Koinegau Saikyou Yuusha wa, Yami no Chikara de Senmetsu Musou Suru Unofficial English title: The Dark Massacre of the Vengeful Hero Literal English title as seen on cover pages: The strongest brave who craves for revenge, extinguish with the power of darkness
Light novel authored by Ononata Manimani and character design by Araya; manga illustrated by Sakamoto Akira.