OPUS: Echo of Starsong is described as a narrative adventure game I found it mixed graphic adventure elements with RPG/visual novel mechanics quite adeptly. The two adopted sisters are searching for Lumen caves on their own personal mission and end up thrown together with Jun and Kay shortly following an altercation with pirates. While trying to get information on a potential new cave, a twist of fate leads Jun and Kay to encounter Edalune and Remi.

In doing so, Jun hopes to bring honor to his clan and help elevate their status. Players take on the role of a much younger Jun Lee, setting out with his loyal guardian Kay, the duo hoping to explore caves and find deposits of Lumen after being exiled from their people. It is also a universe dealing with the aftermath of a terrible war for the rare and highly sought resource, leaving a great scar on those in its wake. The narrative is a science fiction tale set in a universe where mystical caves float in space, containing a highly sought-after element called Lumen that is capable of a great many things. This is how OPUS: Echo of Starsong sets its stage, weaving a story both moving and beautiful in equal measure. His recollection reminds him that the bonds formed on such an impactful journey can transcend even the boundaries of time and space. Traversing the nearly-mystical cave, he reflects on events sixty-six years prior, recalling that the most difficult thing in the entire universe is learning to love and accept yourself while living your own life. An elderly man explores a cave untouched by humans for several decades in the hope of reuniting with a woman he made a promise to long ago.

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