Immortality's Mysteries - S1.E4

After Sakuya confirmed that Karasuma and the BOARD researchers released the Undead, Shiori refuses to believe it because her father was a researcher with BOARD. She eventually finds Karasuma and Sakuya, and Sakuya explains his intentions. The Moth Undead begins terrorizing people and Chalice hunts it down because it attacked his home. Shiori brings Kotaro to Karasuma, but Karasuma's body spontaneously combusts when they arrive.