Latest data released by the Japanese Cabinet Office - 26 February 2018

- Coincident index 120.2 vs 120.7 prelim
Preliminary figures can be found here. A minor fall compared to preliminary figures, but nothing substantial. Not a major data point.
The index is used as a reference to economic conditions, but most of the indicators used to make up the index has already been released individually - so there isn't much of an impact on this release.
The index basically measures up employment data, consumer confidence, production, housing, and stock market data, etc as its leading indicators to derive the number.