Kousuke Chizu


 * This article contains major plot spoilers from the manga that have not been revealed in the anime. Proceed at your own risk.

Kousuke Chizu is the adoptive father of Nanako Tenjo who took her in after the death of her parents.

History
Kousuke Chizu was originally a professor who used to teach at a university called East Bay University. It is this university that Kirio Kikuhara attended. At some point, he adopted Nanako and two other children, but he never saw her playing with them, as Nanako had closed off her heart following a traumatizing incident. When he retired, he started, for a few years, to hold study groups at his house. It was just a hobby, but all kinds of people, like researchers, politics, students would come. It is due to these meetings that Nanako got to meet Kikuhara and eventually join the CCC, because of his influence, she got over her trauma and directed all her hatred towards devils.

Appearance
Kousuke is a short, elderly man with wrinkles on his face. He has short spiked hair and a straight hairline. He has visible jawbones and small, light-colored eyes.

Personality
Kousuke is a sociable man, as his idea to start a study group united a lot of people and himself with other people with the same interest. He is also kind-hearted and considerate as he deeply cares about his children and their well-being. He regrets not saying much when Nanako sounded prejudiced while talking about devils, since he claimed he couldn't say much considering her circumstances. However, despite Nanako's personality and traits, Kousuke is confident that Nanako is a very kind-hearted and considerate girl, but notes that she is just blunt and awkward.

Story
To find out more about Nanako, her motives, and how she met and developed a relationship with Kikuhara, Takashi Sawazaki discussed about these matters with Kousuke, her adoptive father. Kousuke speaks out about how Nanako was after the death of her mother and Morisawa, and how she came over her trauma when she met a certain someone; Kikuhara.