the Nippon calls weren't forced, try were crafted into the song. they used the recordings from the Nippon call app, which was meant to send support from the Japanese people to the atheletes. in doing this the song becomes a song in collaboration with the Japanese people with mm to cheer on japan.
what I love about this single is it's completely fan service.
egao is what fans wanted with current mm, a change in style.
Kimi no kawari is about the national fans.
what is love is for the international fans.
it's great!