Siblings Minato and Akira Lee have moved to a new town, and they’re expecting things to be different― but not this different! Ghostly figures tower over and pass through buildings, drawing no reaction from the locals, some of whom appear far from normal themselves. When Akira spots a strange creature outside her window, she and her new friends organize a search. If no one else can explain the uncanny appearances, the investigation club will get to the bottom of it!

After coming across the otherworldly “Hirata,” Kaname Ito makes contact with one of the strange “glitches” occurring in town. Meanwhile, Kei Kinjou-Dias determines that the source of the “mysteries” is inside the forest that towers over the center of town. But what will he find there...?

In investigating the strange “glitches” happening all over the town, Minato and Akira reach the center of a large forest, thought to be the source of the mysterious phenomenon. There, they witness a strange scene right before their eyes. Trees floating in midair...huge wild animals...and strange figures in gas masks. Where has Hirata been carried off to? And what is the truth behind the existence of the other world…? ?

The mystery behind the glitches is finally unraveling, and at the heart of it all is the forest. Can the Investigation Club protect the people of Touka-cho now that the glitches are wreaking havoc all over the town…? And what is the relationship between Hideno, Kei, and Gabriel…? The children’s mysterious summer adventure comes to an end in this final installment!