This marks the group's first time singing for a Hollywood movie.
The song "Let's Go!!" was newly written for the movie, and it centers around the theme that everyone from children to adults can be a super hero to someone. According to the group, it has a catchy melody and lyrics that make you want to sing together.
The release date of "Let's Go!!" is undecided at this moment.
Source & Image:Oricon
Thanks to minlilin for the tip!