Yasunao Yoshida

Sōra is a high school student who is basically invisible at school. He is friends with Chūya, who is an unpredictable character that often surprises those around him. Sōra and Chūya both have feelings for the same classmate, Kio Machida. The Machida girl refuses to come to class, because she doesn't want to dye her naturally brown hair black. Their school has unreasonable school rules, especially about uniforms, which include requiring all students to have black hair. Sōra and Chūya decide to stand up to change their school's black school rules so that Machida won’t have to repeat a year of school from missing too many classes.

University student Hagoromo likes to tend to her studies, but it is not easy. She lives at a love hotel operated by her father. She lives with her older brother who is a detective and always asks her for help. It is not just that he is not good at his job. It is also that Hagoromo can travel in time. She has the ability to travel back in time and find out what happened when a crime occurs. As such, she is an arm of the detective agency.