Japan's benchmark stock indices ended Monday's session modestly higher, having swung wildly through the day. The Nikkei 225 gained 60.19 points, or 0.71%, to stand at 8522.58. The broader-based TOPIX was up 3.58 points, or 0.42%, to 850.49. Volume for the Nikkei constituents totalled 1.460 bn, with 128 issues higher and 91 lower.