Futariboshi is 40mP's first original duet using Miku and Gumi, and his 18th published work. It has reached over half a million views on Niconico since it's upload date, thus entering the Hall of Fame. In July 2014, he uploaded a remake cover, sang by Chano and Chiho. This song is featured in 40mP's albums Chiisana Jibun to Oukina Sekai (小さな自分と大きな世界) and Kotaeawase (コタエアワセ) and 41m.