* Topix falls 0.1 pct; Nikkei up 0.6 pct thanks to Fast Retailing

* Investors reluctant to buy ahead of earnings season,10-day break

By Tomo Uetake

TOKYO, April 12 (Reuters) – Japan’s Nikkei share average rose on Friday but was little changed for the week, as many investors stayed on the sidelines ahead of the U.S. and domestic earnings season and an upcoming 10-day holiday in Japan.

The benchmark Nikkei ended the morning session at 21,841.90, up 130.52 points, or 0.6 percent, on the day, largely thanks to its heavyweight Fast Retailing Co Ltd, which soared 7.8 percent to contribute a hefty 160 points, or 0.7 percent, to the Nikkei.

The operator of Uniqlo slightly cut its full-year profit forecast after unusually warm weather forced