***MAY CONTAIN SPOILERS IF YOU HAVE NOT READ PREVIOUS VOLUMES***
Summary (from Goodreads): At first, the residents of Ayakashi Hall are baffled by the discovery of a time capsule containing letters in their own handwriting, apparently from their future selves. But Natsume’s ability to see beyond confirms the truth, and he is overwhelmed by the future he glimpses. The others aren’t sure they want to know the full extent of what is to come when it has so obviously rattled Natsume and their later selves. Even with that knowledge, what can they do differently to face the Night Parade of a Hundred Demons?!
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In volume 9, we return to the past of 23 years ago. It begins with a few little episodes, including a Christmas one where Nobara and Sorinozuka meet a mermaid throwback, as well as a glimpse into Zange’s past.
About half way through the volume, the story returns to the day that the residents of Maison de Ayakashi made the time capsule for their future selves and they discover the letters sent back through time. This discovery changes how things originally went, causing Soushi and Ririchiyo not to have the moment in the park where they confess their feelings to one another.
Forewarned about the Night Parade, the group prepares to battle Mokoto Inugami on the day Carta would have been attacked. But, there is no attack and Mokoto doesn’t show himself.
Everything has changed and there’s no telling what is going to come next.
Summary (from Goodreads): The threat of the Night Parade of a Hundred Demons has driven the residents of Ayakashi Hall to take refuge at their family homes–whether they’d like to or not. But when they’re apart, the situation seems even more hopeless, and one by one the group reassembles at the place that brought them together. Whatever the future holds, they will face it with a united front!
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The Night Parade has attacked Ayakashi Halls in other areas, and the families of the group we’ve come to know and love force them to return to their old homes. While most go somewhat willingly, Soushi is taken by force and returned to the confinement her endured throughout his childhood.
One by one, the throwbacks decide that they should hall be together to form a united front against their enemy, and they gather back at Ayakashi Hall. Once they learn of Soushi’s confinement, there is no question about whether or not they will rescue him.
No one has seen Kagerou since the attacks began and an ally may not be as much of an ally as they all believed.