No. 6 Beyond

Why is this extra book the best one in the series? It was so exciting to read! And why did it still end with a cliffhanger?! The author didn't just conclude the story of Shio and Nezumu fighting against No. 6, she started another arc! And now? Where is the continuation?! What will happen to Shion? Will he also get corrupted by the power he now holds? Will he meet his selfish father who is trying to mess with the City? And will Nezumi go back and try to protect Shion again?
PS: I am glad we didn't get Chapter for Rikiga, I hate this character.