Sanmon Shosetsu/Senryo Yakusha

"Sanmon Shosetsu" / "Senryo Yakusha" (三文小説/千両役者) is a Japanese double A-side single by King Gnu. It was released on December 2, 2020, by Sony Music Labels (Ariola Japan). "Sanmon Shosetsu" served as the theme song for Nippon TV drama A Girl of 35 and was preleased on October 30, while "Senryo Yakusha" was used as a commercial song for NTT Docomo's 5G.

Background and release
On September 25, 2020, it was announced that "Sanmon Shosetsu" would be used as the theme song for the Nippon TV drama A Girl of 35, starring Ko Shibasaki. They later announced that they would release the song as well as "Senryo Yakusha" as a double A-side single in December. This marked over a year since their last single "Kasa", and their first release since their major label debut. "Sanmon Shosetsu" was pre-released on October 30, and the music video was released on November 6. "Senryo Yakusha", used as a commercial song for NTT Docomo's 5G, and its music video were released simultaneously on December 2.