OVA episodes bundled in limited edition volumes of the manga. 
 
The first is Ban no Bangai-hen, which shows a part of the past of Ban. 
 
The second is a collection of 9 short stories. Those are: 
“Muda na Mono Nante Nani Hitotsu” (Nothing is wasted) 
“Oshiete Danchō!!” (Teach Me Captain!) 
“Zanpan Shori Kishidan Danchou no Jikenbo” (Case of the Captain of the Leftover Disposal Knights) 
“Diane to Ban” (Diane and Ban) 
“Naku na, Tomo yo” (Don't cry, my friend) 
“Gilthunder no Shinjitsu” (Gilthunder's Truth) 
“Kekka Yokereba Subete Yoshi” (If the Results are Good, Everything's OK) 
“Uso to Makoto” (Lies and Truth) • “Aibou” (Partner)
 
(Source: Anime News Network)

When they were accused of trying to overthrow the monarchy, the feared warriors the Seven Deadly Sins were sent into exile. Princess Elizabeth discovers the truth - the Sins were framed by the king's guard, the Holy Knights - too late to prevent them from assassinating her father and seizing the throne! 
Now the princess is on the run, seeking the Sins to help her reclaim the kingdom. But the first Sin she meets, Meliodas, is a little innkeeper with a talking pig. He doesn't even have a real sword! Have the legends of the Sins' strength been exaggerated? 
 
(Source: Anime News Network)

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