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...
In other words, all that just now was 
to deepen your Master-Servant bond
Das alles diente also nur dazu,
euer Meister-Diener-Band …
En resumen, ¿eso fue para 
fortalecer sus lazos con Basara
En resumen, ¿eso fue para 
fortalecer los lazos con Basara
Donc, toute cette scène servait 
à renforcer votre allégeance à Basara
In parole povere, quella roba serviva 
per rafforzare il patto servo-padrone
Em outras palavras, isso o que vocês fizeram
 agora foi para aprofundarem seus laços
Получается, вы так усиливаете свою связь
 с Басарой и становитесь сильнее?