Detective Sonia Summers has been moved from her previous location to Libra, a city divided into two sections - "the Upper," where wealth and politics reside, and "the Outside," home to crime, corruption, supernatural occurrences involving monsters or youkai. Each case she works on seems to link the mysterious creatures that inhabit this region. Sonia encounters three unique humanoid youkai - Bem, Bela, and Belo - who aim to safeguard humans against malevolent youkai while battling against them. As "Youkai-Ningen," they are shunned by other youkai due to their human-like lifestyles, and rejected and mistreated by humans when they reveal their true forms. Despite facing numerous challenges, these Youkai-Ningen covertly dwell among humans, pursuing their aspiration of one day transforming into fully human beings.
Belo is a third youkai-ningen who has a cool and detached attitude towards humans and the world. Skilled in gaming, he spends most of his time at an arcade outside with friends. This could be due to a...
Bem leads three youkai-ningen in their own justice missions at any time. With faith that by defeating evil and saving humans, he hopes one day to become human himself. Whenever he senses danger, he ap...
Annabella is the only female among youkai-ningen, who admires humans and wishes to become one herself. She attends Cent Joseph High School, located in Upper Town, under the name "Annabella." Despite h...
Sonia, a young detective who values justice, works at the 18th branch of the Outside despite being demoted from Upper town due to her seriousness and stubbornness. She disregards the customs of the Ou...
Dr. Recycle is an enigmatic doctor and researcher from beyond our world. He specializes in transforming individuals who have lost their desire for human existence into beings with supernatural abiliti...
Detective Joel works in the 18th division of the organization known as "Outside." Despite being a member, he lacks motivation and frequently allows himself to be influenced by Sonia, who consistently ...