There is conflicting info, but Uki may have wrote it.
I love the song, absolutely, but view it as an epilogue to that stage in her career, it's not a "part" of KZK for me. If I were to order her whole career, it might come before or after Ringo no Uta, speaking because Ringo no Uta is basically "This is Shiina Ringo rolled up in one song" and Ichijiku no Hana seems to be about her family, so it's looking towards the future.
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