The youths are raised within enclosed walls, nurtured by robots in a nursery-style atmosphere. Despite the seemingly monotonous existence, the children possess boundless curiosity and potential in this seemingly utopian setting. However, beyond the walls lies a barren and treacherous world inhabited by powerful supernatural entities, devoid of all technology. Maru and Kiruko venture through what was once Tokyo, seeking paradise. Yet, with each passing day, the pursuit seems to be more of a futile quest than an attainable reality.