Harley Hoover

Harley Hoover is a classmate of Karin and Kouichi. He is the closest friend of Kouichi, and they are always seen going along with each other on treasure-hunting ventures. He is to Kouichi what Masami is to Karin. He is in the school's soccer team together with Kouichi.

Kashiwagi is best known for his adventurous spirit and occassional mean comments. He is also interested in strange things such as supernatural powers and bizarre treatments for pollen allergies, for example.