《KAKO》是创作型歌手上北健的第四张EP，作词、作曲、编曲全部由上北健本人包揽。这张专辑以electro house音乐为基础，呈上令人耳目一新的流行音乐。正如专辑标题所示，歌曲的主题是“过去”。专辑内曲目的官方MV描绘的一系列故事也同时公开。 Singer-songwriter Ken Kamikita's 4th EP, with lyrics, music, and arrangements all by Ken Kamikita himself. The album features refreshing pop tunes based on electro house. The lyrics were written on the theme of "the past," as the album title suggests. The official music videos for all the songs, which depict a series of stories, are also available on the web.