As half of the Japanese rock masters B'z, Koshi Inaba gained a strong following for his vocals.
On a solo outing, he maintains a similar sound, but adds a bit more to the melodic end of things.
There are hints of other developments in modern Japanese pop here -- piano rock, chord progressions that hail from the singer/songwriter camp.
The music is otherwise straightforward, however, hiding only the secret that half of the B'z duo is missing from the recording.
The stilted vocal lines are there (still with two singers), the alternately pounding and crooning guitars are there, the massive injection of energy is always there.
Hadou is a fine showpiece for Inaba's solo career, but it's not drastically different from his group career either (which may not be a bad thing).