"Need to find out who the composer is."
Huh, interesting question. The first thing I found was this: https://www.discogs.com/%E4%BD%90%E4%BA%95%E5%A5%BD%E5%AD%90-%E8%83%8E%E5%85%90%E3%81%AE%E5%A4%A2/release/3208781?lang_update=1
It's track B4.

Based on that this would mean that this is only an arrangement. Made by 大野 雄二 (OHNO Yuji), so this guy: https://www.discogs.com/artist/314645-Yuji-Ohno .