His decision making power was null.
The curse took away his will in itself.
And, why are all the Heroes that come to my place cursed?
“Itsuki, what are you going to do from here on out? Think about it.” (Naofumi)
“That is… I don’t know.” (Itsuki)
“That’s because of your curse. You’ll eventually recover. At that point, I’m not sure if you’ll oppose me, but if we do end up fighting, I won’t hold back. Remember that.” (Naofumi)
“… Understood.” (Itsuki)
“Itsuki-sama, I will fight with you so you can make up for your crimes.” (Rishia)