The clip also features clear singing voice of Tao Tsuchiya, who is cast as one of the two protagonists, Shion.
Even though Satomi asks her not to sing, Shion sings without hesitation, and her unexpected behavior causes a big commotion among her classmates.
The official website for the upcoming original anime film Ai no Utagoe wo Kikasete (Sing a Bit of Harmony) has posted a 30-second second teaser trailer introducing its main characters.