A side story Partner in Arcaea. Twin sister of Eto.
Luna is described in the game as a merciless girl. She also does not feel friendly and affable to other people as well, while daring people to play her challenge, Singularity.
She is much more affectionate towards her twin sister, Eto, however, as shown in their side story.
The following tags implicate this tag: luna_(winter)_(arcaea) (learn more).