This is my fourth 가장 좋아하는 Honeyworks song as well as one of my 가장 좋아하는 Rin and Len duets so far. Classic. It's an old one with some poor tuning, but the song itself has really shaped the VOCALOID industry and its personification of the libraries.
This is one of my 가장 좋아하는 Regulus songs as well as one of my 가장 좋아하는 Megurine Luka songs. I remember listening to this just a few hours after it was released.