Leader and Matsuoka's love child. This song was written by the two of them 20 years ago. For whatever reason, Matsuoka decided to bring her into the light for this album. Leader had forgotten all about her. (I use the feminine pronoun because that's what Matsuoka did in his blog.)
While the previous two songs are obviously Mabo and Leader, respectively, this song is very TOKIO. If remember correctly, Nagase did the arrangement. Sweetness.