Links for songs credits:
http://anison.info/data//source/9549.html
https://ja.wikipedia.org/wiki/%E7%89...82%BD%E3%83%B3
Credits for the 2 songs composed by Chumei Watanabe can be found on Chumei's website too:
http://www.chumei.net/review/sfx/janperson.htm
DrillSpin gives the Facebook of 大矢晋/Susumu Oya and so his romanization:
https://www.facebook.com/susumu.oya.1
List of his works with Forte Music Entertainment label:
https://ja.wikipedia.org/wiki/%E5%A4...9F%A2%E6%99%8B