Stay up to date with the NHK World Radio app. It brings you various news radio programs, updated constantly, but also
written news articles. You can select from 14 different languages including, of course, Japanese.
Get it on your iPhone, or on your Android.
NHK World also offers a news television app, for those who like images with their news. This app is available for iPhone, iPad, Android and even Kindle (also free).
NHK is relatively politically neutral, but if you prefer news with a tad more political orientation, try Yomiuri news for a more conservative stance, or Mainichi news for a more liberal stance (currently only offering their websites in English and their apps in Japanese).