Kawaranai Tsuyosa

 (変わらない強さ) is the sixth single by Iguchi Yuka. It was released on February 17, 2016, and peaked at #18 on the Oricon single chart.

Single Information
The lead track Kawaranai Tsuyosa was used as the second ending theme for the anime Heavy Object.
 * Catalog Number:
 * 1000592203 (Regular Edition)
 * 1000592201 (Limited Edition)
 * 1000592202 (Anime Edition)

CD

 * 1) Kawaranai Tsuyosa (変わらない強さ)
 * 2) Valentine Eve
 * 3) Kawaranai Tsuyosa (Instrumental)
 * 4) Valentine Eve (Instrumental)

Anime Edition CD

 * 1) Kawaranai Tsuyosa
 * 2) in flames
 * 3) Kawaranai Tsuyosa (TV size)
 * 4) Kawaranai Tsuyosa (Instrumental)
 * 5) in flames (Instrumental)

Limited Edition DVD

 * 1) Kawaranai Tsuyosa (Music Video)
 * 2) Documentary Of Iguchi Yuka “Kawaranai Tsuyosa”
 * 3) TV-SPOT

Anime Edition DVD

 * 1) Kawaranai Tsuyosa ("Heavy Object" Non-Telop ED)
 * 2) in flames (Music Video) (Animation ver.)

Kawaranai Tsuyosa

 * Lyrics zopp
 * Composition: toku
 * Arrangement: toku

Valentine Eve

 * Lyrics: Satomi
 * Composition: Suzuki Kazushi, Nagasawa Chiaki
 * Arrangement: Sasaki Hiroshi

in flames

 * Lyrics: Kisuke
 * Composition: Watanabe Takuya
 * Arrangement: Watanabe Takuya