Hello Pro Maruwakari Yojijukugo (ハロプロまるわかり四字熟語) is Hello! Project's first Hello! Project Station related book. It was released on March 19, 2016, on the first day of Hello! Project Hina Fest 2016 and was also made available on the online e-LineUP! store. The book was decided to be published due to the popularity of the Four-Character Idiomatic Compounds corner featured in Episodes #74 to #151 of Hello! Project Station.