Volume 31

Koichi Hirose (Echoes) (広瀬康一(エコーズ)) is the third volume of Diamond is Unbreakable and the thirty-first volume of the JoJo's Bizarre Adventure manga. It covers the Koichi Hirose (Echoes) story arc and the Toshikazu Hazamada (Surface) story arc.

Chapters

 * 019 (284). Koichi Hirose (Echoes) (1)
 * 020 (285). Koichi Hirose (Echoes) (2)
 * 021 (286). Koichi Hirose (Echoes) (3)
 * 022 (287). Koichi Hirose (Echoes) (4)
 * 023 (288). Koichi Hirose (Echoes) (5)
 * 024 (289). Toshikazu Hazamada (Surface) (1)
 * 025 (290). Toshikazu Hazamada (Surface) (2)
 * 026 (291). Toshikazu Hazamada (Surface) (3)
 * 027 (292). Toshikazu Hazamada (Surface) (4)
 * 028 (293). Toshikazu Hazamada (Surface) (5)