This is the 3rd song in the series "Star Girl and the Illusory Musical"
"You all have no interest in 'reality', do you?". We are introduced to Dr. Realist and his girls (assistants? daughters?) Rho and Lambda, the two from ANTI THE∞HOLiC. Dr. Realist is a strange gentleman who despises the people within the city for not facing reality and escaping into the city's illusions. He attempts by any means necessary to make the citizens realize the truth. However, the results generally don't end well as the different candidates can't stand the reality.
Star Girl and the Illusory Musical Paradise (星ノ少女ト幻奏楽土) is a series by Story Researcher (doujin group formed by cosMo and GAiA). CosMo is in charge of the music and illustration, while GAiA collaborated with him in the lyrics. The songs in this series are to be released on an album of the same name. This series is the sequel to The Fantastic Garden (空想庭園) series.