| Title | Singer | Writer | Album |
|---|---|---|---|
| Ashes of Dreams / Aratanaru | Keiichi Okabe, Kakeru Ishihama, Keigo Hoashi, Takafumi Nishimura | NieR Gestalt & Replicant OST | |
| Emil | Keigo Hoashi | NieR Gestalt & Replicant OST | |
| Song of the Ancients | Keigo Hoashi | NieR Gestalt & Replicant OST |