Seija is fought at the end of Senkai (Invaded). By completing her boss fight, her recruitment is allowed at the Hakurei Shrine.
Battle[]
| Action | Condition | Effect |
| Suspicious Pills | Turn 1 | Inflict Overdose on all enemies (Healing effect reduced by 1/2) |
| Creepy Flower | Turn 2, No condition afterwards | Deals damage on all enemies, may inflict Venom |
| Substitute Jizo Statue | Automatically used when HP reaches 85%, 55%, 25% | Physical and Magical Defense increases to 200% on the user, but the effect immediately wears off on the next turn |
| Huge Needle | None | Deals damage to single enemy, may inflict Wound |
| Four-Foot Magic Bomb | 90% HP or below | Deals damage to all enemies, may inflict MDEF down |
| Dark (Fake) Seven Star Sword | 80% HP or below | Deals Darkness damage to single enemy, DEF down |
| Headache Inducing Cacophony | 65% HP or below | Deals damage to all enemies |
| Obnoxious-looking Stopwatch | 50% HP or below | Deals damage to single enemy, may inflict Stop |
| Flashy Pagoda | 30% HP or below | Deals damage to all enemies |
| Miracle Mallet Replica | 30% HP or below | Deals damage to single enemy, may inflict Stun, INT down |