Aileen finds out that Claude's aide, Keith Eigrid, has been selling demons. Keith tells Aileen about the reason why and reminisces about their past. Now that Aileen knows his true feelings, she decides to cooperate with Keith to prevent Claude from despairing about humanity and turning into a demon. At the same time, Cédric and Lilia visits the demon lord's castle to tell Claude Keith's secret?!
It's the first and most important 
rule of the pact, but...
...إنّها أوّل وأهمّ قاعدة في الاتّفاقية، لكن
Das ist das oberste Gebot
des Nichtaggressionspaktes.
Esa es la regla más importante
del pacto, pero…
Esa es la regla más importante
del pacto, pero…
Cela risquerait de briser
le pacte de non-agression.
È la prima e più importante regola
 del patto, tuttavia...
Essa é a primeira e mais importante
regra do pacto, mas...
Это основной пункт пакта о ненападении.