Is This a Zombie?, Vol. 3

Ayumu and his housemates are getting on just as if they were an actual
warm (or, in his case, cold) and loving family. And with Eu under threat
from a mysterious nemesis known only as the "King of Night," the motley
crew is tighter than ever as they resolve to keep the "shady
necromancer" safe. But when the resident vampire ninja, Sera, receives
orders from home that threaten Eu's well-being, will she turn her back
on her new friends?!