Ignorant Philistines claim this is their weakest song, but this is Masashi's tribute to Jasmine You when he took over as the band's bassist. And as far as tributes go, they knocked it out of the park.
If this is their weakest song (which I literally don't agree. If you have listened to their discography, they have a lot of mid songs, this one being one of the bests technically and symbolically) this talks about how good are their strongest ones