Judy and Mary
Like the past four singles she has released, the title song was produced by ex-Judy and Mary member Takuya, while the lyrics were personally written by Takahashi herself after she read the original book. As can be heard in the movie's trailers, "Tsuyoku Nare" is a ballad song very similar to "Ko·mo·re·bi". The coupling track is an alternate recording of Hitomi's 2005 single "Aozora no Namida". The new recording of the song gives it a much stronger punk/rock feel to it as opposed to the original version, which was heavily influenced by pop/rock.