Persona Trinity Soul takes place ten years after the end of persona 3 (PS game). It is set in ayanagi city, a city located near the sea of japan, where the police force in investigating several cases involving a mysterious illness called apathy syndrome. Ten years ago, ayanagi city had been subjected to a boy named shin and jun kazato move back to ayanagi city to see their big brother Ryo, who is now the superintendent of the ayanagi city police. It has been ten years since the there siblings last meet with each other. It was said that mysterious incident in ayanagi city were linked to convert testing conducted under keisuke komatsubura’s watch, who try to located all known persona users and find the strongest by weeding them out via persona experiments before it was disbanded.