"Now then, why don't we kick off this talk between family?"

The Demon Lord lives! And he has a bone to pick with Kelvin. It turns out the ancient Demon Lord from hundreds of years ago loves his daughter a little-actually, not just a little-too much, and now Kelvin's head is on the chopping block. Can Kelvin survive against someone who fights exactly like Sera, only bigger and angrier?

Meanwhile, Sera herself is busy battling Condemner of the Apostles, with whom she seems to have a special connection! This is turning into a mire of special family circumstances, and behind all that, the Apostles are continuing with their secret plans...