Japan has four clear-cut seasons with rainy season between spring and summer .
the seasons are created by seasonal winds blowing toward Japanese archipelago.
The Japanese climate is influenced by geographicla location,summer and winter monsoons,ocean currents and topographical features.
Ｔｓｕｙｕ is an early summer rainy season which lasts in the middle of July.
The rain is extremely required at rice planting time and for tapping water in major cities.
With clay figures placed around its periphery , Kofun is a burial mound which was built for the ruling class from the late 3rd to the 7th centuries . It contains numerous funerary objects like jewels and mirrors as well.