Thanks to Gordon’s father, Asta and the others were able to find out that there might be clues surrounding the devils in the Heart Kingdom and manage to get permission to enter the kingdom due to the fact that Mimosa had gone there previously to study overbroad. Asta, Noelle, Finral, Mimosa and Nero head to the Heart Kingdom. Asta and the others initially enjoy their trip there, but something that Langris told Finral had been bugging Finral. Suddenly, Asta and the others are faced with a rather unexpected trial. Will Asta and the other Black Bulls be able to obtain information on the devils?!
If what lies at its center 
is indeed a devil or a curse,
،إن كان ما يقبع في وسطها شيطان أو لعنة بالفعل
Wenn in der Mitte von all dem
der Fluch eines Teufels steht,
Si la clave de todo eso
es un diablo o una maldición,
Si la clave de todo eso es un diablo
o una maldición,
Si ce qu’il renferme
est un démon ou une malédiction,
L'idea che nel cuore di quel regno ci sia 
davvero un demone o una maledizione
Se o que jaz no centro do reino é
mesmo um demônio ou uma maldição,
Стоит только подумать,
что в её сердце таится проклятие демона…