I liked the episode, although I only understood the jokes once I went back and did some research on the terms used. The whole “blue” bit was actually about the term “uruu” (閏), which means a leap month/week/second, etc. In the ep’s case, they used it to mean a superfluous person or thing. The “blue” bit was a play on words. As for the “suruu” vignette, “suruu” is a term meaning to ignore or pay no mind. Hope this helps. :)