| Operation | Story |
| AP-1 Originium Mining Security
|
Tough Siege Next AP-2
|
 | |
| Defend against enemies in a hostile environment. <Poison Haze> Operators lose HP constantly. | |
Information
| Recommended level | Level 1 | ||
|---|---|---|---|
| Sanity | Drill Plan | EXP | LMD |
| 10 | 1 | 100 (120) | 100 (120) |
| Unit Limit | Initial DP | Life Points | Enemies |
| 8 | 20 | 10 | 24 |
| Additional information | |||
| The Poison Haze deals 5 Pure damage every 0.5 seconds to all friendly units. | |||
Drops
| First clear | Regular |
|---|---|
3 Stars  | Guaranteed  |
Enemies
| Normal | Soldier ×3, Originium Slug ×16, Monster ×2, Hound ×3 |
|---|