鑰匙是啟動機車的必要條件，也指向一種控制與使用權。能夠啟動順吉的只有我與鎖匠，因此這把鑰匙代表了一種專屬的關係，以及日常生活中的依附。

透過對鑰匙的凝視與辨識，我們是否能在眾多相似的鑰匙之中，認出每天使用的那一把？人與物之間的熟悉與歸屬，正是在時間的流動與相處之中累積形成的。

The key is what brings Shunji to life. In this world, probably only I—and a locksmith—can start him. Because of this, I began to look closely at Shunji’s key, memorizing its scratches and marks left by use, so that among countless other keys, I would still be able to find this one.