Rainbow Song
虹の女神 Rainbow Song (original)
Starring Hayato Ichihara, Juri Ueno, Yu Aoi, Shoko Aida, Fumiyo Kohinata, Ami Suzuki, Wakana Sakai, Hiroyuki Onoue, Emi Suzuki, Hidekazu Mashima
It's a drama and romance movie, and has a rating of 7.3 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Austria.