Nikkei's winning streak runs into profit-taking

* Low trading volume may be a sign for correction - analyst * Tomy falls after Marunouchi Capital sells entire stake * Kyushu Electric rises after nuclear reactor restart announcement By Ayai Tomisawa TOKYO, May 26 (Reuters) - Japan's Nikkei share average edged down on Tuesday morning, snapping a seven-day winning streak as investors took profits after the recent gains made on optimism over the economy's recovery and higher shareholder returns. The Nikkei 225 dropped 0.1 per