Volume 31

Koichi Hirose (Echoes) is the thirty-first volume of the JoJo's Bizarre Adventure manga. It is also the third volume of Part IV: Diamond Is Unbreakable. It covers the Koichi Hirose (Echoes) and Toshikazu Hazamada (Surface) story arcs.

Chapters

Title
Chapters	Release Date	ISBN
Volume 31: Koichi Hirose (Echoes) (広瀬康一(エコーズ) Hirose Kōichi (Ekōzu))
284. Koichi Hirose (Echoes) (1) (広瀬康一(エコーズ) その①, Hirose Kōichi (Ekōzu) Sono 1) 285. Koichi Hirose (Echoes) (2) (広瀬康一(エコーズ) その②, Hirose Kōichi (Ekōzu) Sono 2) 286. Koichi Hirose (Echoes) (3) (広瀬康一(エコーズ) その③, Hirose Kōichi (Ekōzu) Sono 3) 287. Koichi Hirose (Echoes) (4) (広瀬康一(エコーズ) その④, Hirose Kōichi (Ekōzu) Sono 4) 288. Koichi Hirose (Echoes) (5) (広瀬康一(エコーズ) その⑤, Hirose Kōichi (Ekōzu) Sono 5) 289. Toshikazu Hazamada (Surface) (1) (間田敏和(サーフィス) その①, Hazamada Toshikazu (Sāfisu) Sono 1) 290. Toshikazu Hazamada (Surface) (2) (間田敏和(サーフィス) その②, Hazamada Toshikazu (Sāfisu) Sono 2) 291. Toshikazu Hazamada (Surface) (3) (間田敏和(サーフィス) その③, Hazamada Toshikazu (Sāfisu) Sono 3) 292. Toshikazu Hazamada (Surface) (4) (間田敏和(サーフィス) その④, Hazamada Toshikazu (Sāfisu) Sono 4) 293. Toshikazu Hazamada (Surface) (5) (間田敏和(サーフィス) その⑤, Hazamada Toshikazu (Sāfisu) Sono 5)	(JP) March 4, 1993[1]	(JP) ISBN 978-4-08-851637-0