GJ8man

Gorou Joe is a boy who lives a carefree life in the small historical town of Gujo Hachiman in Gifu prefecture. One day an old self-professed water fairy appears in front of Joe, and tells him to help people, and grants Joe the power to turn into GJ8 Man (a pun on Gujo Hachiman, as the number 8 is pronounced hachi in Japanese, and the hachi in Hachiman uses the kanji for the number 8).