I'm a Warden in a Demon World

Love, death and demons are the main themes of this world, People long for love, people are afraid of death, but people long for the devil, everyone wants the power of the devil, In this era of symbiosis with demons, Noccaro owns a devil's prison... When the first demon roared in prison, and when the first "devil contract" was exchanged for a heavy bag of money, he embarked on a journey to "collect" demons...