Volume 31

Koichi Hirose (Echoes) (広瀬康一(エコーズ)) is the thirty-first volume of the JoJo's Bizarre Adventure manga. It is also the third volume of Diamond is Unbreakable. 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)