Now that y'all mention it, I am getting some Platinum Era vibes from "Sou Janai"...although a more apt comparison would be Berryz Kobo's "Dakishimete Dakishimete"
(seriously, it totally sounds like it)
I do like it for those reasons, though...I'm not quite "in love" with the song right off the bat, but I can imagine it'll grow on me as time passes (more listens with better quality and the music video).