YUKI released, “Wonder Line” on December 12, 2007. Both “Wonder Line” and “Wonder Line (Night Swimming Mix) were used in FOMA N905i CMs. Upon release, “Wonder Line” peaked at number four on the Oricon weekly chart, selling 23,147 in its first week on the charts.
“Wonder Line” is an interesting song with variety. YUKI’s vocals are very different, even when compared to her J-pop peers. Her voice is high and particularly nasal. Nevertheless, she controls that nasality fairly well in this song, which makes a world of difference in the chorus. It’s catchy and upbeat, with the hook “wonder line.” The surreal instrumentation, orchestrated backing, and strong beat really create an excellent J-pop in the end. YUKI’s experience shines through on this track. The only downside to the song would be that YUKI’s voice is a bit high, and the extro is a bit long. But if you can take those “bits,” “Wonder Line” is a good song.
The “Night Swimming Mix” of “Wonder Line” is much more real in it’s instrumentation, opting for mainly strings and piano and a soft bongo beat. The song sounds very pretty, but doesn’t have the power of the original mix of the “Wonder Line.”
“Biscuit” is more of rock song mixed with piano and violins here. Live, YUKI’s voice gains a welcome bit of depth, and the music feels as if it fills the room. YUKI is a musician and that shines through on “Biscuit” as she performs wonderfully. A nice way to round out a wonder of a single.
Considering YUKI’s music can be too stylistic and nasal to listen to, “Wonder Line” is a welcome step towards the mainstream for YUKI.