| Achievement Category | Inter-Knot Hot Topic |
| Description | In non-Joint Investigation modes, equip three Agents with 6 “Phaethon’s Melody” Drive Discs each and complete 1 battle. |
“Phaethon, Oh Phaethon!”
| Achievement Category | Inter-Knot Hot Topic |
| Description | In non-Joint Investigation modes, equip three Agents with 6 “Phaethon’s Melody” Drive Discs each and complete 1 battle. |
idk about Promeia synergy, but i plan to use her with Nangong Yu (or Vivian sometimes) and Yuzuha.