"Yōkai Ningen Bem Returns" is a continuation of the classic "Yōkai Ningen Bem" series, revisiting the lives of Bem, Bela, and Bero, three humanoid yōkai who strive to protect humans despite being ostracized by society. The narrative explores their ongoing quest for redemption and acceptance, as they aim to transform into humans by performing good deeds. Set in a modern urban environment, the story intertwines supernatural elements with themes of morality, identity, and the struggle between good and evil.

The trio, each with unique abilities, encounters various yōkai and human adversaries while aiding those in need. Bem, the leader, possesses superhuman strength and a strong sense of justice. Bela, the only female member, has the ability to manipulate her hair as a weapon and exhibits a compassionate nature. Bero, the youngest, is agile and quick-witted, often providing comic relief but also demonstrating bravery. Together, they face challenges that test their resolve and humanity, often confronting their own inner conflicts and the prejudice they endure.

The plot delves into episodic adventures where the trio battles malevolent yōkai and corrupt humans, often uncovering deeper societal issues such as greed, discrimination, and the consequences of unchecked power. Each encounter reinforces their commitment to protecting humanity, even as they grapple with their own identities and the possibility that their dream of becoming human may remain unattainable. The series maintains a balance between action, emotional depth, and philosophical undertones, making it a compelling exploration of the yōkai-human dynamic.