Welcome to the fascinating world of Gensokyo, in which youkai (A term for all sorts of spiritual creatures), animals and some humans live, completely separated from our world by a magical barrier. The only gateway between the two worlds is the Hakurei shrine. Reimu Hakurei is the maiden working at said shrine. Whenever problems of supernatural causes (known as "Incidents") occur, Reimu goes out with her friends to investigate, eliminate the cause and hopefully restore Gensokyo to its equilibrium.

Twenty-second Series.

Yakou, a gentle human woman, works at a detective agency. Tounome is a smart and gentle invisible man. The invisible man's ability is perfect for detective work. However, the blind Yakou can still figure out where Tounome is, even if he disappears. Before they know it, the two become attracted to each other...?

When Arisu Yamabuki was all alone in bed at night, he was able to find solace in the voice of a radio host who went by "Apollo." However, one day, she simply stopped broadcasting without any explanation. Years then passed, and Arisu is now a second-year high-schooler. He makes it his mission to search for Apollo, as there is something he wants to tell her. He doesn't know what she looks like, or even what her real name is, but he manages to get some leads on her in his school's broadcasting club. That's where he meets four girls who all dream to get a job where they can make full use of their voices! Just who is Apollo, and how will those four's dreams pan out?