On that shows website there's apparently a preview with the song playing in it. Haven't had chance to look yet, but I've read 2 people say "sounds like Jihen" already :-p
http://www.ntv.co.jp/tsuma/movie/index.html
Content blocked in your country.
ESIT: Got round it. Wouldn't say it sounds like Jihen. Pretty much sounds like an
old school SS-era Ringo rock ballad to me (written by Nu-Ringo of course).
Could be good... approaching with optimistic caution.