Heavy cruiser Nachi
Mental Model (anime) | Mental Model (manga) | Vessel
Japanese name 那智
First appearance:
Manga Chapter 48
Anime Aoki Hagane no Arpeggio DC movie
Mental Model information:
Status Unknown
Affiliation "Fleet of Fog"
Mental Model's Appearance:
Eye color Yellowish (manga)
Green (anime)
Hair color Lime-green
Vessel Status:
Status Sunk
Sunk by Matsushima
Vessel information:
Type "Fleet of Fog" Myoukou-class heavy cruiser
Displacement 13,500 tons
Length 201.7 m
Beam 20.73 m
Draft 6.32 m
Maximal Speed 90 knots
Armament 12x torpedo tubes;
Photon cannons;
missile launchers;
depth charges;
Wave-Force Armor yes
Voice Actors:
Japanese Satō Satomi
German Unknown

Nachi is a "Fleet of Fog" heavy cruiser from the First Oriental Fleet. She is a part of the I-401 pursue fleet led by battleships Kongou and Hiei. She and her sister Ashigara were the ones actively searching for I-401.

Heavy cruiser NachiEdit

Nachi is a "Fleet of Fog" reincarnation of WWII Myoukou-class heavy cruiser Nachi. She has three sisters, all of whom have made their appearance within the series: Myoukou, Ashigara and Haguro.

In anime, Nachi's hull is forest-green with lighter green for some parts; the glowing insignia are also in light green.

It appears that Nachi, as a Myoukou-class heavy cruiser, is similar in design and armament to succeeding Takao-class heavy cruisers: ten main Photon cannons on five active turrets, a number of smaller Photon cannons, a multitude of missile launchers and 12 torpedo tubes. In anime she exchanges her Super-Graviton Cannon for an enhanced sonar detection system.

She's also supposed to have a moderately-powerful Wave-Force armor, but since Nachi is yet to suffer through any enemies' attacks on-screen, it is impossible to verify this fact.

Mental ModelEdit

Heavy cruiser Nachi has one Mental Model. She appears as a girl of about fifteen to seventeen years old. She has short lime-green hair and rather strange yellowish eyes.

Nachi, like all of her sisters, wears a version of Hiei's 'school' uniform. She also has an armband around her left forearm and a ribbon-framed emblem of the "Fleet of Fog" stitched to the right sleeve of her jacket. Unlike her sisters, she wears pantyhose instead of stockings. Also, given what Haguro had asked Myoukou about reverting to their normal looks, it is assumed that Nachi normally wears different clothes.

Unlike her sister and partner Ashigara, Nachi is calm and rather gentle and peaceful. This seems to be a widely-known fact as Iona was the one who pointed it out to her crew, instead of them learning this from direct contact with Nachi. Furthermore, Nachi is very respectful and soft-spoken when speaking to her superiors and seems to be someone who might apologize even if she hasn't actually done anything wrong. She's also quite sharp and cunning, which makes her ideal for her job of gathering intelligence on the enemies.


Nachi is a part of the I-401 hunting squad led by battleships Kongou and Hiei. She and her sister Ashigara were sent to search for I-401. And as soon they had located her, Ashigara attacked right away. Nachi, however, remained passive and didn't engage I-401.

As Ashigara continued pursuing I-401 and found herself at a disadvantage against a submarine while underwater and requested some help from her sister Nachi. The resulting attack, though, only made the situation worse for the two heavy cruisers as they lost the submarine in the debris cloud. Ashigara also received a torpedo to her face (literally).

Following this skirmish, it was decided that Nachi should be partnered with Haguro instead. Around two hours after the first encounter, I-401 attacked again. This time she was using a manually-controlled Active decoy with three Corrosive Warhead Torpedoes loaded onto it. I-401 managed to get her decoy very close to Nachi and Haguro and then detonated the warheads. Haguro had her keel snapped into two by the resulting 'explosion'.

The First Oriental Fleet then regrouped after the attack with Nachi acting as the fleet's sensor. Initially aiming for Kongou with the Auxiliary Super-Graviton Cannon, Gunzou shifts targets and aims at Nachi instead. Nachi, too late to react and caught in the cannon's gravition field, was then sunk in one blow. The fates of Nachi's Union core and her Mental Model are currently unknown.


  • Kongou - Nachi's flagship.
  • Hiei - Hiei is the de facto flagship of the First Oriental Fleet, to which Nachi belongs.
  • Myoukou - Nachi's older sister and commander.
  • Ashigara - Nachi's other sister and her partner during the beginning of the I-401 hunt. After the first skirmish with I-401, Ashigara was replaced with Haguro.
  • Haguro - Nachi's partner during the second phase of their skirmishes with I-401
  • I-401 - A target to be sunk. Got a nasty surprise from her instead


  • Myoukou, Nachi, Haguro and Ashigara are the only set of sister vessels that made appearance within the same chapter.
  • Personality-wise Nachi is quite similar to Ayanami Rei from "Neon Genesis Evangelion". And on black-and-white manga pages, they actually look a little alike.