Toyosaki Aki (Yui in K-On, member of Sphere, etc., etc.) is doing the voice of a cartoon character on the weather part of NHK's flagship evening news program, News Watch 9.
The weather lady speaks with Haru ("Spring") as they forecast the weather.
Click here to see a brief movie of them on-screen. Here are photos of Haru-chan and Aki-chan, and a screenshot from the show: