Sonzai to Jikan

Disclaimer: Guess.
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/ Guardian /
/ I am the guardian of time
I guard the gate of time /

/ Wanderer /
/ I have wandered through time
I have seen many eras /

/ Wandering guardian /
/ I am forbidden to leave my post
Wandering through time, I can only watch
I am a wandering guardian of time /

/ Solitude /
/ I am a solitary guardian
I am a solitary wanderer
I live in solitude
I have lived this way for many eons /

/ Existence /
/ My existence is lonely
My existence is timeless
I exist for one sole reason
And one reason only /

/ Time /
/ Time is my existence
Time is the only reason I am here.
I live within time, and yet outside of time /

/ Existence and time /
/ My existence is time
Time is my existence
They are one and the same /

/ Time and existence /
/ I am Sailor Pluto, the solitary guardian of time /
I am a wanderer of time
My only existence is time, and only time is my existence /
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Translation notes:
sonzai to jikan: existence and time (Japanese)