The subway boss is the only fight in the game with a hard damage gate. For the first two Landmarks, Kaede Mori cannot be hurt — not because she is armoured, but because the fight has not given you permission yet. Everything before the third Landmark is survival, and everything after it is a short, ordinary boss fight with trains in it.
The encounter runs in the vision layer of the Okawamachi Station dive, on the fused-sector platform of the Kasumino Line. The approach is the same building you have been through twice already, which is why the fight feels easier to reach than it is to survive.
The gate: three Landmarks
The first Landmark destruction starts the sequence. The second does not open the damage window either. Only after the third Landmark breaks do your bullets start mattering.
That is worth stating plainly because it changes what the first half of the fight is for. There is no point conserving ammunition for a damage phase that is not coming; there is every point conserving health. Players who spend the first two phases trying to squeeze damage in are the ones who arrive at the third with nothing left.
The train attacks
Once the Landmarks are down, the arena turns into a rail problem. Trains arrive through portals, and the portals do not all open at once.
| Attack | Tell | Answer |
|---|---|---|
| Omnidirectional trains | Portals open all around the platform | Stand where no track has been laid — there is always a safe zone |
| Ground thrust | A portal opens under the floor | Move to the back of the area, then rush forward when the portal appears underfoot |
| Sequential trains | One portal opens after another | Wait on the last track that appears, watch which portal the first train takes, then move |
The sequential pattern is the one that reads as random until you know the trick. The tracks appear in an order, and the last one to appear is the one that will still be clear when the first train passes. Stand there, watch one pass, then move — not before.
The ground thrust inverts the usual instinct. Backing away from the portal is wrong; the attack chases the floor backwards. Going to the rear of the arena first is what makes the forward run possible, because it gives you room to run forward.
After the third Landmark
With the damage window open, the fight becomes conventional: shoot her, keep moving, and treat the trains as the arena's timer rather than as an attack aimed at you. The same lateral discipline that answered Mädchen applies — direction beats timing.
Expect the train patterns to continue during the damage phase. The fight does not split into "dodge phase" and "damage phase"; it asks you to do both, and the players who stop moving to line up a shot are the ones who get clipped by a train they had already survived once.
Ariadne's thread
After the fight, the story grants a thread that lets Reona pass through walls. It is not a combat tool — it is the route to the next room, and it is easy to miss if you leave the arena expecting a lift.
Who you are actually fighting
The in-game report for creature No.045 describes Kaede Mori as a civilian who was stranded in the anomaly, awakened the ability to manipulate reality, and used it to keep other survivors alive. The fight is the point where that protection stops being distinguishable from hostility.
That is also why the objective is worded as neutralising her rather than killing her, while the trophy list still calls it eliminating. The two wordings sit on either side of the same fight.
The approach is part of the fight
The vision layer is entered before the arena is. Lights sweep the platform and the section is built around not being caught in them, so the approach is a stealth route rather than a corridor. The Landmark at the end of it is not optional scenery — destroying it is what starts the sequence, and it is the first of the three.
This means the fight effectively begins with a health check. Arriving at the third Landmark with most of the bar intact is the whole preparation; arriving with a third of it turns a survivable pattern into a two-mistake fight.
Loadout, and what the trains do to it
Nothing in the arena rewards a specific weapon. What it punishes is reloading at the wrong time: the train patterns run on their own clock, and a reload started at the wrong moment is a full second of standing still on a platform that does not forgive it.
Two habits help. Reload during the gaps between patterns rather than during one, and treat weapon swapping as something you do while moving laterally, not while lining up a shot. The fight has no ammo refill of its own, so the reserve you bring is the reserve you finish with.
A shotgun is a reasonable choice here for the damage window, because the range is short and the boss does not retreat far. A rifle is the safer choice if the train patterns are still killing you, since it lets you keep more distance from the rails.
What the fight is teaching
This is the game's clearest statement about patience. Two phases of guaranteed invulnerability exist to make you stop treating damage as the objective and start treating the arena as the problem to solve. Once the gate opens, the fight is short — shorter than either the shopping street or the gravity zone.
It is also the fight that punishes standing still the hardest. There is no cover worth holding on a platform, and no pillar to put between you and a train. The only defensive resource is the floor you have not been pushed off yet.