Does anyone know the details of Japanese singer Yoshinaga Masaji?

Tell me what you know: a native of Okayama Prefecture, Japan, started playing guitar in high school and started writing his own songs at Osakanoe University. He won a special prize from the examiner in a talent show in his hometown, and then people from big record companies found out that he went to Tokyo to develop. Most of the supporters are women aged 20 to 30, and there are also a considerable number of older male fans.