In a bustling city, whispers of another dimension exist—a parallel realm that reflects our world but operates by entirely different rules. People claim to hear faint echoes of their alternate selves during moments of intense emotion. An unassuming linguist, Leona, accidentally deciphers a pattern in these echoes and discovers how to communicate with her "other self" from the parallel realm. As Leona delves deeper, she uncovers a mysterious phenomenon: the two realms are starting to merge, causing chaos in both worlds. To prevent catastrophic consequences, she must collaborate with her alternate self to restore balance. Along the way, she confronts questions about identity, free will, and the cost of interdimensional harmony.