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After some pretty heavy dialogue from Hiruko about those classmates who are choosing not to fight inThe Hundred Line: Last Defense Academy, Eito vanishes suddenly the following day, and everyone realizes with one of the Extinguishers missing from the Entrance Hall that he must have left the school.
Bring Darumi and Takemaru with you as you venture out on an expedition beyond the Undying Flames to find Eito (picking up plenty of early-game resources as you go), and prepare to save him from the clutches of some tough invaders before you carry him all the way back to school.

How To Rescue Eito From The Invaders
Step One: Find Eito
Go to the Cafeteria on the morning of Day 006 to learn thatEito has left the schoolfollowing the threats Hiruko made the day before. She refuses to join your expedition to go find him and bring him back, butDarumi and Takemaruwill join your exploration mission, so meet them in the Entrance Hall and interact with the fire extinguishers to venture outside.
If you haven’t done aboard game expedition beyond the Undying Flamesyet after they unlocked earlier in the week at the Academy, this is the mechanic you’ll use often tofind essential resources, treasures, or missing characters when the story requires, though you may choose to head out on your own adventures during any morning Free Time segment.

The goal of this segment is tonavigate to the checkpointhighlighted when you firstentered the board game map, but you’re free toexplore and gather resourcesalong the way. Try not to lose too much HP for the team doing battles that you don’thaveto do unless you’re familiar with the combat system (or are on a subsequent playthrough after your first), since you’ve got a boss fight of sorts coming up when you discover Eito on the marked space on the board. He’s surrounded, though, so you’ll need to fight to save him.
Step Two: Battle
The goal of this battle is toeliminate every invader on the board, while remaining mindful toprotect Eitofrom any further harm. You can see Eito’s HP down in the bottom left corner of your screen, and the invaders will attack him just as readily as they’ll attack you, soprioritize protecting Eito, since you’ll need to try again from the start of the fight if the invaders finish him off beyond the Flames where he can’t be revived by the drones.
As a regular character in combat, Eito only takes up one space on the board, so it’s not a bad idea to surround him as best you can. There are only four spaces from which he can be hit - combat doesn’t permit kitty-corner attacks on single target moves, so putting your three teammates removes three of the four spaces from which Eito can reasonably take damage.

Hopefully you’ve been focused onleveling up your Class Weaponsduring your free segments, because all three of your characters can learn secondary moves before you leave the school that will come in handy here. you may get by without them, but with Takumi gaining a stronger attack for single or double foes, Takemaru’s improved fork-like prong attack, and Darumi able to restrict the enemy advancing on Eito, upgrading Class Weaponsduring Free Timesegments is always a good idea.
Thankfully, each of the fighters on your team has multi-target attacks, sotake out as many enemies as you canon your turn to minimize how many enemies mobilize against your team once you’ve expended your AP. You’ll need to pay special attention to the larger invaders, but it’s also a good idea tofocus on killing the larger invaders, since doing so replenishes one AP when you take it out, which means you can string together some pretty sweet combos between that and your Voltage attacks.
Once the final invader goes down, the battle ends and you’ll bring Eito back to school, earning plenty of Battle Points for your efforts in the fight.