Kiyomizu is a free theme for WordPress created by Okamoto Hidetaka.
This theme has 2column post list. Customized Twenty Fifteen Theme
(Description "Kiyomizu" Theme from wordpress.org)
You can download Kiyomizu for free via the provided download link and include it into your themes folder of your WordPress installation. Also you can directly search for it in the WordPress admin interface in the themes section and install and activate it from there.
More information, screenshots and reviews of Kiyomizu Theme can be found here.