After ending the battle against Zolgia, Basara regains his peaceful life with his two little sisters, Mio, the daughter of the previous demon lord, and Maria, her little sister who's also a succubus. As Basara pursues the preparations for the sports festival at school, one day he's attacked by a person being manipulated by magic. Recalling the strange gaze he felt at school, a suspicion of his begins to grow...
what the Master-Servant pact 
you all share was like.
was der Meister-Diener-Pakt ist,
den ihr alle teilt.
supiera cómo se siente estar atada 
al pacto que comparten.
cómo se siente estar atada 
al pacto que compartís.
en quoi consiste 
le pacte qui vous unit.
in cosa consiste il patto servo-padrone 
 che condividete.
o que realmente é o pacto 
Mestre-Servo que vocês possuem.