Hiroshi must go on an official trip to Kyushu and Kyushu, which is why everyone in the Nohara family has decided to spend the night with a childhood acquaintance of Misae's in Assou, Kumamoto.
The group arrives at Kumamoto Station, on their journey towards Assou. Unknown to them, a stranger offers them a camera with a odd situation. He demands witnesses.
In his camera's new the palm of his hand, Shinnosuke can enjoy his holidays in the picturesque Assou mountains and fields in the most beautiful way. The Assou landscape is even crawling with animals that he could never find in Kasukabe. Also, there are townspeople who will help him along with making new acquaintances.
Do they not look a lot like his children in the home?
An evening in the summer heat, Shinnosuke is able to see a huge creature silhouetted against the glow of a full moon. A man with a strange smile is standing next to it.
It's the same weird man that gave him the camera at the station...
and he refers to himself as the Professor Akuno. Assou has been witness to many odd events in the aftermath of the encounter.