The Shadow Girl in the Seat Next to Me was The Recommended Singer

Summary

One day, Tsunagu, a high school student who loves composing but is terrible at singing, becomes the photographer for the school festival with Otoha, an introverted girl who sits next to him.When his friend is in a pinch, he offers up his own song, but when he listens to it, it's a disastrous demo tape version.Just as he is getting into even more trouble, Otoha appears in disguise, ad-libbing lyrics to the song and singing it...