What effect does the South east air mass have on japan?

The South East air mass, originating from the North Pacific Ocean, brings warm, humid air to Japan. This air mass is associated with the summer season in Japan and contributes to the country's hot and humid climate during that time. The South East air mass also brings abundant rainfall, leading to the formation of clouds and precipitation. This rainfall is crucial for agriculture and water resources in Japan and contributes to the lush vegetation and greenery for which the country is renowned.