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)
 * Lyrics zopp (Track 1), Satomi (Track 2), Kisuke (Track 3)
 * Composition: toku (Track 1), Suzuki Kazushi (Track 2), Nagasawa Chiaki (Track 2), Watanabe Takuya (Track 3)
 * Arrangement: toku (Track 1), Sasaki Hiroshi (Track 2), Watanabe Takuya (Track 3)

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.)