An Archdemon's Dilemma: How to Love Your Elf Bride: Season 1, Episode 3

1 - 3: The Quieter They Are, the Devastatingly Scarier They Are When Mad

Chastille and several other Angelic Knights assault Zagan's castle, but he's unwilling to start stacking up bodies with Nephy around. When his hesitation puts him in danger, Nephy unleashes her own power to save him.