Friendship fighters find times are tough
Makoto Sakai has championed Sino-Japanese friendship for decades but the past few years are times he would rather forget.
After spending years fostering ties between the two Asian giants, the bilateral relationship took a sudden nosedive in 2001.
The immediate trigger was Japan's decision to approve eight new school textbooks, which critics say gloss over the country's wartime aggression, an issue particularly sensitive in China.
Rows over history books have been just one regular source of tension since the two countries normalised diplomatic ties in 1972. Others include the Diaoyu Islands dispute, contested oil fields in the East China Sea and disagreement over compensation to war victims.
Last year the Japanese watched their national footballers abused and taunted by angry Chinese fans in Beijing at the Asia Cup Final.
Tokyo businessman Makoto Kamikawaji says he was shocked by what he saw on the television.