After the Villainous System Forced Me into a Deal

My name is Hirafuji Hisakawa, and I'm a mental patient (not really). One day, the mental hospital got blown to pieces, and I discovered a whole new world. I was also strong-armed by a shady System into taking a job, turning evil, and coming back to life.

Right now, I'm freeloading and waiting to die in a traditional, patriarchal family called the Zenin clan, while the System has apparently crashed somewhere. I swear, this is the happiest time of my life!!!

Note: The protagonist thinks differently from ordinary people, so don't try to discuss morals with a madman.

Theme: Kindness