Kou is one of the Partners in Arcaea. She is unlocked by purchasing the Crimson Solace pack in the "Side Story" section. Kou has been officially described as "a cheery girl with a long history in the world of Arcaea". Seemingly in reference to both her namesake and the name of her pack, Kou is primarily dressed in shades of red.
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.
