Rina san's song is in the just released film
パパのお弁当は世界ー / Papa no Obento wa Sekai Ichi
(Papa's Bento are the World's Best)
The film was just released, and you can see Rina here
with Toshimi Watanabe, Rena Takeda, and Sho Kiyohara
at a promotion event.
パパのお弁当は世界一 (2017) 映画予告編