Osaka Sogo (逢坂 壮五)
CV: Abe Atsushi (阿部 敦)
Yotsuba Tamaki (四葉 環)
Thank you to anonymous for the commission! This is the first song in their album, Rain, and it was also the ending song for the 12th episode of the anime.
Composed by: Shogo & Hayakawa Hirotaka
Lyrics below, as well as a YouTube sample.