English translation

The exact title would be 'The Reality's Reverberations'. The real difference between an echo and a reverberation is that an echo is a longer sound that tends to be reflected back in a clearer way like waves, repetitions, while reverb tends to me shorter sounds bouncing back from various surfaces, giving a natural sense of space and vastness around a place. Echo just seemed to convey the idea in a more approachable way for general understanding.

In that sense, one could say that instead of having substantial pieces of reality coming back to them (such as memories, lessons/understandings, feedback of some sort), the author is only sensing fractions of these things getting back to them over time. Makes it feel more complex to piece together the meaning and understanding of the reverberation, which might also partly explain the emotional state of the author in the song, the feeling of being lost, seeking for peace, being somewhere else, somewhen else.