The song was the band's first single since the release of "Sayonara wa Emotion", after which they took a year's hiatus in light of bassist Ami Kusakari's pregnancy.

The title of the song was borrowed from Osamu Tezuka's Shin Takarajima, which Yamaguchi came across while researching manga for musical inspiration.

The bonus CD included in the limited editions, called Motion Music of Bakuman, featured every song from the film.

"Shin Takarajima" drew inspiration from Bakuman, embodying the story of a young man and woman striving to become manga artists.

"[2][3] The song itself includes lyrics that highlight the "sweat and tears that come from creating," a feeling shared among both manga artists and musicians.

"[3] The film Bakuman includes a scene during the credits where the two protagonists forgo attending their graduation ceremony to talk in a classroom.

When questioned, he explained, "I felt I needed to study and learn more about making theme songs and background music for manga.

When brought to the attention of Bakuman production staff, the original title was scrapped, and "Shin Takarajima" was chosen.

As the deadline for the film approached, work on the album was further delayed by bassist Ami Kusakari's pregnancy and loss of inspiration by keyboardist Kiemi Okaza.

After receiving a script for Bakuman, Yamaguchi described feeling as if he were being encouraged by the director, pushed to create a bright song.

[2] However, in an interview conducted by music magazine Talking Rock, Yamaguchi emphasized his potential audience: "I knew high school and university students were a clear, distinct market.

Composition for Shin Takarajima proceeded on this idea, and after the NF launch party, Yamaguchi was purportedly able to finish the lyrics for the song.

Previous singles "Sayonara wa Emotion" and "Good-Bye" composed by frontman Yamaguchi focused on "shadow" as a motif; by contrast, "Shin Takarajima" took "light" as its theme.

Parts of the intro resemble the work of Japanese band Godiego, proceeding, as Yamaguchi explains, into a comical theme with a pop tempo.