Joint Firing Drill 12 Breakthrough Guide

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General Stratagy

This rotation of Joint Firing Drill is relatively simple and can be dealt with by generic AoE Piercing damage dealers. However, if you are attempting to clear stage 3 or 4, there will be new stage mechanics to look out for.

The first thing to look out for on all stages is the Scarecrow. In general, you will always want to heal the Scarecrow to full HP before dealing damage. As they apply a debuff to all enemies on field that increases the damage they take up to 500% of current HP.

However, from stage 3 onwards, it is important to note that it has an ability called “Scarecrow Status Changes”: This causes the Scarecrow to have two states. The main thing you need to keep in mind is this debuff icon . While this debuff icon is active, the Scarecrow reduces all healing it receives to 1.

This means that you should only heal the Scarecrow while it does not have the debuff icon.

Lastly, for Stage 4, we have “Enemy Death Zone of Flames”; As the name would suggest, this effect leaves a puddle of fire upon an enemy's death. Dealing damage to students that move through it. Keep in mind that the damage dealt from this effect can be dangerous if students are standing in its AoE for a long period of time. This can easily be worked around by changing the position of your team, healing the damage off, or applying shields.

Team Building

When building a team for this Joint Firing Drill, we want to have a good mix of AoE damage dealers to clear out the mobs for each wave and a Healer to top off the scarecrow to maximize the damage dealt. You can also consider taking general supports and tanks to help with damage, cost regen, and survivability.

Character Recommendation


Serina,Chinatsu,Kokona,Koharu,Mari (Track),Atsuko,Ayane,Nodoka (Hot Spring)


Iori,Cherino,Momoi,Midori,Tsurugi,Nonomi,Junko,Moe,Serika (New Year)

General Supports:

Fuuka (New Year),Ako,Himari,Kotama,Hoshino (Swimsuit),Shizuko (Swimsuit)


Hoshino,Hoshino (Swimsuit),Tsubaki,Atsuko,Tsurugi

General Stage Information

Constant Effects

Drill Terrain (Indoor Warfare)
This drill will take place in indoor terrain.
Enemy Defense Type (Heavy Armor):
Enemies' defense type will be Heavy Armor.

Stage Details

Stage 3 and 4
Enemies Level: 65 (Stage 3) & 78 (Stage 4) 
Additional Stage Machenics:
Scarecrow Status Changes
The status of the Scarecrow changes at set intervals.

Status A: When the Scarecrow is fully healed, it deals damage to allied students and does not recover HP.

Status B: The Scarecrow Recovers HP when healed.
Enemy Death Zone of Flames (Stage 4 Only)
Upon enemy death, created a zone of flames in that location.


Mass-Produced Automaton (Shield)Mass-Produced Automaton
Mass-Produced Automaton
Scarecrow (Wave 1)Scarecrow (Wave 2)Scarecrow (Wave 3)

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