@@kellamyoshikage286 an original song in this context means a song that’s just made without any association with any other work/franchise. In other words, a standalone product. This song was made for an eroge.
Awesome track! My space/star theme bias is not helping-- Like how could I not love the lyrics and the composition, this is like ascending beyond the binds of time and space (☆▽☆) Astraythem looks good actually, I'll look into it (I need more VNs to read)