Jigokuraku: Utakata no Yume

What enemies did Gabimaru and Sagiri encounter before landing in Shinsenkyo? How did the Aza Brothers become the leaders of the bandits? How did Yuzuriha kill Makiya right after landing in Shinsenkyo? Why did Tenza come to look up to Shion as his master during his dojo days?
This book is filled with the pasts of popular characters and unknown stories!