FLOW released “Sorrow” on October 8, 2026, as the opening theme for the second season of A Returner's Magic Should Be Special.
KOHSHI ASAKAWA wrote the lyrics, TAKESHI ASAKAWA composed the song, and FLOW arranged it. The band previously provided “GET BACK” for the anime's first season.
“Sorrow” is available through official streaming services. The track will also feature on an October 28 double A-side single with “UNSTOPPABLE”. See the official FLOW announcement.