Germany has half the percentage of forest as Japan
On average sure, but there are regions in Germany with both high amount of forest areas and fairly high population density (e.g. Ore Mountain region up to 50% forest area and more than 200 people/km^2).
Context:
Germany, area 357,022 km2 (137,847 sq mi) water 1.27%
Japan, area 377,975 km2 (145,937 sq mi), water 1.4%
On average sure, but there are regions in Germany with both high amount of forest areas and fairly high population density (e.g. Ore Mountain region up to 50% forest area and more than 200 people/km^2).