Shousetsu Natasu no Taizai: Gaiden - Nanairo no Tsuioku

Shaking the wide plains of Britannia, known only to a select few, is the legendary travelling tavern the BOAR HAT. Gathered in this tavern are the equally legendary Seven Deadly Sins, the proud order of knights that permits no disruption to the order of the Kingdom of Liones. In a brief moment of peace before the great war that will test their strengths, the knights gather in the strange tavern to recall their rainbow-­colored histories. The three episodes here reveal their hidden sweet and painful memories. (Source: Kodansha USA)