Eto & Luna are one of the Partners in Arcaea. They were obtainable during the Empire of Winter event in a World Mode map in Chapter 0. They were available for a limited time from December 23, 2018 to December 31, 2018 and were made available again from December 23, 2019 to December 30, 2019.



Main Article: Eto, Luna


Compared to their regular clothing, both twins' outfits are thicker and have fluffy accents, befitting the winter theme. Their capes have been replaced with short capelets with fur trim. Their berets are decorated with ribbons, berries, and ornaments; Eto's is a star while Luna's is a crescent moon.

Eto's clothing is white, with the sole exception being the blue ribbon on her beret. Aside from her capelet, she wears a long-sleeved shirt, a pair of shorts with a fur belt and trim, and a pair of short heeled boots with fur trim and pom-poms. A pair of small angel wings are attached to her lower back. She holds Kou's teddy bear in her arms.

Luna's clothing is dark blue with red accents. Beneath her capelet, she wears a short, layered dress with long bell sleeves and fur trim, decorated with a red bow at her waist. Her stockings extend to just above her knees and end in fur trim and small red bows. Her shoes have red trim and are decorated with pairs of berries. A pair of small devil wings are attached to her lower back. Luna still holds her rapier, but a long red ribbon has been tied around it, accessorized with small bells and an ornament similar to those present in Kou's outfit.


This section is a stub. You can help by contributing information to it.

Stats by Level

LEVEL 1 2 3 4 5 6 7 8 9 10
FRAG 52 52 52 52 53 54 56 58 62 66
STEP 24 24 24 24 24 25 26 27 28 30
OVER 39 39 39 39 39 40 42 44 46 49
LEVEL 11 12 13 14 15 16 17 18 19 20
FRAG 71 75 79 81 83 84 85 85 85 86
STEP 33 35 36 37 38 39 39 39 39 40
OVER 53 56 58 60 62 63 63 63 63 64


Eto & Luna currently holds the highest FRAG stat for a support type partner, at 86.

  • Their maximum FRAG stat translate to 1.72x fragment multiplier.
  • Their maximum STEP stat translate to 0.80x step multiplier for world mode.

This makes them one of the most viable support-type partner for fragment farming, suitable for players who are not confident about clearing charts. However, this does come at a cost with their skill having reduced recollection rate per note, even if the player starts at 30%. As such, not getting LOSTs are still a priority – more so, in fact, due to their fragment farming potential.

Their step stat is perhaps one of the lowest STEP for a support-type partner, but as discussed in Hikari (Zero)'s notes, the low STEP stat can be used for landing on a Stamina tile.


This section is a stub. You can help by contributing information to it.


  • Winter event launch celebration image by cierra.
Starting Partners HikariTairitsu
Story Partners Tairitsu (Axium)Tairitsu (Grievous Lady)Hikari (Zero)Hikari (Fracture)Tairitsu (Tempest)
Side Story Partners KouLetheEtoLunaSayaKanae
Collaboration Partners SapphireHikari & FisicaTairitsu & TrinHikari & SeineTairitsu (Grievous Lady) & Chuni Penguin
Soundtrack Partners Hikari (Fantasia)Tairitsu (Sonata)
Limited-Time Partners StellaIlithShirabeHikari (Summer)Tairitsu (Summer)AyuEto & LunaYumeNono ShibusawaHaruna MishimaRegulus (MDA-21)Pandora Nemesis (MTA-XXX)Chuni PenguinSiaDORO*C
Community content is available under CC-BY-SA unless otherwise noted.