《Simple And Clean》是宇多田ヒカル为游戏《王国之心》系列创作的主题曲之一。这首歌通过一对年轻恋人的视角探讨了爱情中的复杂情感与成长的烦恼。歌词反映了年轻人在面对恋爱关系时的迷茫和不确定，以及对于未来的一种既期待又担忧的态度。
When you walk away you don't hear me say, Please oh baby don't go. 这句表达了歌手对恋人离开时内心的不舍之情，希望对方能够留下。
Simple and clean is the way that you're making me feel tonight, It's hard to let it go. 歌手形容恋人给予的感觉是如此纯粹美好，以至于难以放手。
You're giving me too many things lately, You're all I need. 说明了对方近期给自己的影响很大，已经成为了自己生活中不可或缺的一部分。
Oh no you smiled at me and said, Don't get me wrong I love you, But does that mean I have to meet your father? 通过对话形式展现了一种青春期特有的矛盾心理：虽然彼此相爱，但对于更深层次的关系承诺感到犹豫。
When we are older you'll understand what I meant when I said No, I don't think life is quite that simple. 表达了随着年龄增长，人们会逐渐理解到生活并非总是那么简单直接。
So simple and clean, The daily things like this and that and what is what, That keep us all busy are confusing me. 描述了日常琐事虽然简单却让人感到困惑不解。
Wish I could prove I love you, But does that mean I have to walk on water? 再次强调了证明爱意并不需要做些不切实际的事情。
When we are older you'll understand, It's enough when I say so, And maybe some things are that simple. 随着时间流逝，或许会明白有些事情其实非常简单。
Hold me, Whatever lies beyond this morning is a little later on, Regardless of warnings the future doesn't scare me at all, Nothing's like before. 最后几句则展现了对未来充满勇气的心态，即使前路未知也不再害怕。