Shin chan Me and the Professor on Summer Vacation The Endless Seven-Day Journey

Hiroshi is required to go to Kyushu for business. So the Nohara family of four decided to spend time with Misae, Kumamoto, a old friend from childhood.
They arrive at Kumamoto Station, on their journey to Assou. An unknown person offers them a camera , which is in strange situation. He asks for witnesses.
Shinnosuke is able to enjoy the Assou Mountains and fields in the summer months by using his camera at his feet. The scenery is even crawling with wildlife that he’d not see in Kasukabe. There are also townspeople who are willing to help him as well as the possibility of making new friends.
Do they not look a lot like his children from their home?

Shinnosuke spotted a gigantic creature in silhouette against the moon on a cool evening in the summer. An unsettling, smiley man sits next to the monster.
A similar man handed the camera back to him when he arrived at the police station…
He calls himself Professor Akuno. Assou is witness to more weird events because from this incident.