Karakuri Double Box

This puzzle is the remade veision of designer Akio Kamai's "Double box". There are two layers inside the box. The inner mechanism was made by simplifying a unique contrivance of Akio Kamai's that was originally used in one of his puzzles called the PENTAGON in 1984.
The objective is to figure out how to open the box. A beautifully unique box to display and collect.

Size (box body) : 120×85×58mm
Size (storage part) : 41×77×34mm

Solution is included.