Crows Gaiden, クローズ外伝, 続・クローズ外伝 NEXT CROWS SUPPLEMENTARY STORY

The first of the three Crows Gaiden volumes written and drawn by Takahashi Hiroshi himself (the other two being / Crows: The Aftermath, and Zoku - Crows Gaiden / Next Crows Supplementary Story, which has been incorporated into this entry). All 3 volumes contain origin stories and can be read at any time, regardless of how far one has got in the main series.