Marona has the ability to see and communicate with phantoms, a set of abilities collectively known in-game as "Chartreuse". This power enables her to make a living as a Chroma, a kind of adventurer-for-hire, despite being at such a young age, but it also makes her feared and shunned by other people, many thinking that she is possessed. She lost her parents when she was five, but Ash, a friend of her parents and a former Chroma-turned-phantom, came back to protect Marona after the demise of her parents and himself.