It's a pretty work.
"Kuru Kuru" means "round" or "revolve".
As the name, it rounds and you can make a shape of heart.
Through this motion, you can open the lid. It isn't difficult.
It takes 4 moves to open.
(It's different from the "Secret Heart"（MY-１）.)
Craftsman : Tatsuo Miyamoto
Size (box body) : 140×60×60mm
Material : walnut, etc.