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The Hundred Line -Last Defense Academy- Combat Guide: Master Every Mechanic

The Hundred Line -Last Defense Academy- combat guide covering every mechanic, advanced techniques, and the strategies that separate good players from great ones.

EarlyGuides Editorial Team
Researched and editorially reviewed. Updated .
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Too Kyo Games and Media.Vision released The Hundred Line -Last Defense Academy- on 24 April 2025 for Switch and PC, with Kazutaka Kodaka and Kotaro Uchikoshi writing and Aniplex publishing. Takumi Sumino is pulled out of the Tokyo Residential Complex into a school ringed by fire, where fifteen students form the Special Defense Unit and hold the building for 100 days against School Invaders. Story days alternate with grid based battles, and the choices you make across those days fork the run into 21 routes and just over 100 endings.

Combat in The Hundred Line -Last Defense Academy- rewards knowledge over reflexes. Understanding how each mechanic works (and how they interact) is what turns a struggling player into a dominant one. New here? Start with our beginner's guide for the basics.

Core Combat Mechanics

1. Shared AP pool with rollover

Each player phase gives the whole squad one pool of attack points rather than one action each, and the player team always moves first. Moving and attacking are a single action, so a unit walks its movement range and swings at the end of it. Any AP left unspent carries into the next turn, which makes a deliberately quiet turn a real opening rather than a wasted one.

Why it matters: This is the foundation of all combat. Everything else builds on this.

2. Voltage meter capped at 300 percent

Landing attacks builds Voltage, which carries between waves of the same battle but holds at a maximum of 300 percent. Anything generated above that cap is discarded, so spending at 300 is always better than saving for a moment that may not come. Voltage pays for Special Moves, for Boost Hemoanima and for Move Again.

Why it matters: The most underrated mechanic. Players who master this early have a massive advantage.

3. Hemoanima Special Moves

Hemoanima is the blood drawn power the students fight with, and Takumi Sumino's takes the form of a katana with wide horizontal and vertical sweeps plus one armour piercing strike, on a movement range of roughly five to six tiles. Special Moves spend Voltage to either clear a cluster or punch through a single hard target. Boost Hemoanima spends Voltage on a buff instead, such as raising attack.

Why it matters: Unlocks a new layer of gameplay depth once understood.

4. School shield defense objective

Most battles are lost by letting the academy's shield or a protected generator fall rather than by losing students. Invaders path toward the objective every enemy phase, so holding lanes usually beats chasing kills. Takumi's power allows a battle to be restarted outright, which is the intended response to a shield that dropped further than you meant it to.

Why it matters: The tactical edge that separates average players from advanced ones.

5. Exploration tiles and Fire Extinguisher levels

Between story days you send students across five exploration areas built from resource tiles. The School sits in the centre with the most Battle Point tiles, the Desert to the north yields Machine, the Forest to the east yields Plant, the Underground to the south yields Mineral and the Coast to the west yields Textile. Desert and Forest need a level 2 Fire Extinguisher, and Underground and Coast need level 3.

Why it matters: The endgame optimization mechanic. Small improvements here compound into massive gains.

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How These Mechanics Combine

Understanding how mechanics interact is where real optimization happens:

Shared AP pool with rollover + Voltage meter capped at 300 percent

Each player phase gives the whole squad one pool of attack points rather than one action each, and the player team always moves first. When combined with Voltage meter capped at 300 percent, landing attacks builds voltage, which carries between waves of the same battle but holds at a maximum of 300 percent. This combination is the core of every effective build.

Hemoanima Special Moves + School shield defense objective

Hemoanima is the blood drawn power the students fight with, and Takumi Sumino's takes the form of a katana with wide horizontal and vertical sweeps plus one armour piercing strike, on a movement range of roughly five to six tiles. Paired with School shield defense objective, most battles are lost by letting the academy's shield or a protected generator fall rather than by losing students. This is why the tier list favors builds that leverage both.

Exploration tiles and Fire Extinguisher levels as a Multiplier

Between story days you send students across five exploration areas built from resource tiles. The School sits in the centre with the most Battle Point tiles, the Desert to the north yields Machine, the Forest to the east yields Plant, the Underground to the south yields Mineral and the Coast to the west yields Textile. Desert and Forest need a level 2 Fire Extinguisher, and Underground and Coast need level 3. This system amplifies everything else. The better your Exploration tiles and Fire Extinguisher levels optimization, the more your other mechanics pay off.

Combat by Build

Each build approaches combat differently:

Takumi Sumino (A-Tier)

Combat approach: Balanced combat style. Key equipment: Hemoanima katana Primary mechanic: Shared AP pool with rollover

Takumi Sumino offers a solid combat experience. Full setup in our builds guide.

Hiruko Shizuhara (A-Tier)

Combat approach: Balanced combat style. Key equipment: Special Move Primary mechanic: Voltage meter capped at 300 percent

Hiruko Shizuhara offers a solid combat experience. Full setup in our builds guide.

Karua Kashimiya (A-Tier)

Combat approach: Balanced combat style. Key equipment: Boost Hemoanima Primary mechanic: Hemoanima Special Moves

Karua Kashimiya offers a solid combat experience. Full setup in our builds guide.

Darumi Amemiya (A-Tier)

Combat approach: Balanced combat style. Key equipment: Strategic Material Primary mechanic: School shield defense objective

Darumi Amemiya offers a solid combat experience. Full setup in our builds guide.

Eito Aotsuki (A-Tier)

Combat approach: Balanced combat style. Key equipment: Move Again Primary mechanic: Exploration tiles and Fire Extinguisher levels

Eito Aotsuki offers a solid combat experience. Full setup in our builds guide.

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Advanced Combat Techniques

Damage Optimization

  1. Match your equipment to your build's stat priorities
  2. Exploit Shared AP pool with rollover for maximum damage windows
  3. Chain Voltage meter capped at 300 percent and Hemoanima Special Moves for combo damage
  4. Use School shield defense objective to create openings

Survivability

  1. Learn enemy patterns before committing to attacks
  2. AP is a squad resource, not a per unit one. Ending a turn with points left over is a legitimate strategy because the leftovers roll forward, and a banked turn followed by a five action turn beats two average turns almost every time.
  3. Position using Shared AP pool with rollover to control spacing
  4. Save defensive options for guaranteed survival, not comfort

Boss Combat

Bosses test your understanding of every mechanic. See our boss guide for fight-specific strategies.

  • Phase awareness: Most bosses change behavior at health thresholds
  • Patience over aggression: One extra hit per opening beats dying to greed
  • Build preparation: Swap gear and equipment for specific fights when needed

Common Combat Mistakes

  1. Button mashing: Committed attacks have recovery frames. Mashing locks you into animations.
  2. Ignoring Voltage meter capped at 300 percent: This mechanic exists for a reason. Players who use it take significantly less damage.
  3. Wrong equipment for the situation: Check our weapons guide for situational picks.
  4. Not learning from deaths: Every death teaches something. If you don't know why you died, you'll die the same way again.
  5. Overcommitting: Trading hits works in School area but will get you killed in Coast area.

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