Hikari is shown in Eternal Core's story to be somewhat impulsive, saying what she feels and choosing to gather the Arcaea purely on a whim. She is also careless, not concerning herself with questions of her origins or circumstance, instead traveling through the world eager to see all the memories she can. Her exposure to only light Arcaea leaves her unaware of the darkness in the past, contributing to her naïve mindset.
Arcaea
Arcaea are melodical shards of the past that call out to the girls, but each chooses to be experienced only by one or the other. Over time, the girls begin to notice inconsistencies in the Arcaea that choose them and develop conflicting views about the world as it once was.
