Recollection of Heavy Metal

Diamond & Club Side Story: Recollection of Heavy Metal (追憶のヘヴィメタル（ダイヤ＆クラブ外伝) Tsuioku no Hevimetaru (Daiya ＆ Kurabu Gaiden)) is a one-shot manga. It was published in the February 2013 issue of Monthly Comic Zenon.

Plot

This story is a spinoff prequel to the original Fist of the North Star by Buronson and Tetsuo Hara, and covers the events of Diamond & Club's lives prior to their appearance in the manga.