[4] A year after the dissolution of SMAP, Kusanagi, alongside former members Shingo Katori, and Goro Inagaki formed the group, Atarashii Chizu.

Moreover, his Korean-language-Japanese-produced movie The Hotel Venus (ホテルビーナス, Hoteru Bīnasu) (March 6, 2004 Japan public presentation) was submitted to the Moscow International Film Festival on June 25, 2004.

In 2020, Kusanagi took on the role of Nagisa, a transgender nightclub worker in Eiji Uchida's Midnight Swan.

[7] As a member of the boyband SMAP, Kusanagi used to co-host the weekly variety show SMAP×SMAP alongside his bandmates for 20 years.

Originally, Chonangang was intended to focus on Kusanagi's journey in South Korea, however lasted eight years due to its popularity.