Data streams (ex: logs) are becoming larger, while analytics in (semi-) real time is also becoming more important today. Moreover, there are many non-programmers who wants to write queries in this big data era. Norikra is an open source server software that provides "Stream Processing" with SQL, written in JRuby, runs on JVM. We can write and add queries for stream easily on Norikra, without any editors, compilers or deployments. I will talk about implementation of Norikra and its application in LINE corporation.