User blog:Admiral Mikado/Extra Operations for Dummies: 2-5

World 2-5: 【Extra Operation】 沖ノ島沖 Okinoshima Sea


This map is an Extra Operation, a type of bonus level that rewards you with medals, ranking points and other things upon clearing, and resets at the start of each month.

You need to clear 2-4 in order to unlock this map.

Sinking the flagship at the boss node reduces the boss gauge by 25%. Therefore you have to sink the boss 4 times in order to clear the map. Clearing this map rewards you with 1 medal & 100 ranking points.

With the right fleet setup you can get through this map pretty smoothly, especially because there is more than one route to the boss, each with its own requirements, so you can pick one depending on the ships you want to use.

This is the first Extra Operation map where a certain amount of LOS (索敵) is required to get to the boss node. For details, refer to Line of Sight.

Fleet Setup


Recommended Fleet Setup: 2 CAV 3~4 CA(V) 0~1 CLT

A fleet with at least 2 ships that have a Drum Canister equipped and no CV(L) whatsoever is guaranteed to go to node A.

There are only light and medium enemy ships (i.e. DD, CL(T), CA) on the north route, so CA(V)s & CLTs are more than enough to deal with them. At least 2 CAVs are necessary because they can equip Drum Canisters while CAs can't. Theoretically you could bring a BB, but that creates the possibility of ending up at the dead end node G, so I advice against it. Besides, you don't need one to defeat the boss anyway.

You can replace the CLT with another CA(V) if you want. You'll lose the preemptive torpedo strike, but CA(V)s have more firepower & armour, which increases their survivability and overall shelling phase performance. You could also bring another CLT instead of a CA(V), but I can't recommend this because the standard CLT setup doesn't leave any room for LOS equipment, which could make passing the LOS check more difficult.

Since there are no enemy carriers on this route, even one CAV with a seaplane bomber guarantees Air Supremacy on all nodes, enabling Artillery Spotting.

However, since the boss node has three battleships that your medium-sized ships have to defeat, they should have sufficiently high levels. Around Lv.50~60 should be okay, depending on your HQ Level, but using Kai-2 ships would be even better.

Heavy Cruisers / Aviation Cruiser


This is pretty much the standard setup for CA(V)s. Just give them your best guns, radars and seaplanes. Your CAVs should be equipped with at least one seaplane bomber like Zuiun and its variants for guaranteed Air Supremacy on all nodes.



Since the second node is a night battle node, equipping a Searchlight, Star Shell and Type 98 Recon Seaplane (Night Scout) is highly recommended. They also help at the boss node.



Two ships need a Drum Canister for your fleet to go to node A.

Torpedo Cruisers


The usual stuff. A midget submarine is mandatory, otherwise you might as well use a regular light cruiser.

The remaining two slots are filled with either guns for a double attack setup or torpedoes for a Cut-In setup. It doesn't matter whether they're main or secondary guns, they can't trigger Artillery Spotting to begin with and in night battle it doesn't matter. Firepower isn't that important because even with strong guns a CLT's shelling is mediocre at best, and you're using them for their torpedo strikes and night battle attack power anyway. 15.5cm Triple Gun Mount (Secondary) is a good choice due to its accuracy bonus, but in the end you can give them whatever.

Unless you've fed them Maruyus for luck and/or it's Kitakami, I don't recommend a Cut-In setup because their luck is rather low, so they won't trigger it reliably. Even without torpedoes their opening strike is just as capaple of sinking ships, and you don't really need the "BOOM, HEADSHOT!" power of a Cut-In anyway.

Node Guide
Node A consists of CL(T)s & DDs that should go down rather easily. Just go Line Ahead. If you bring CLTs they can each take out one ship with their opening torpedo strike. Your CA(V)s then take care of the rest. Since there are no carriers you get Air Supremacy by default thanks to your seaplane bombers, so your CA(V)s can double-attack them to death. If you get lucky the air strike might even be able to take out one or two ships. The only dangerous part of this node is that due to the absence of BB(V)s there's only one shelling phase, so if your ships fail to sink them all or at the very least moderately damage them by the end of it, their torpedoes can hurt quite a bit.

Node D is a night battle node, so the majority of runs can end. There's not much you can do except pray that your night battle equipment triggers and your ships survive. Which formation is the best at night battle nodes is still heavily disputed, but it's usually either Double Line, Echelon or Line Abreast. Just try them out and stick to the one that works the best for you. Especially players with HQ Lv.90+ can suffer a lot on this node because there's a chance that the enemy fleet's flagship is a Heavy Cruiser Ri-Class Kai Flagship, who has a very high chance to trigger a Cut-In which usually wrecks one of your ships, forcing a retreat. However, apart from her the other ships don't pose that much of a threat.

From node H to L (boss node) you need to pass an LOS check, but CA(V)s already have fairly high LOS by themselves, and their radars & seaplanes should be more than enough to pass, so there's basically nothing to worry about.

Although your ships have to face three battleships, the boss node works pretty much the same like node A. Your CLT (if you bring one) is almost guaranteed to take out one ships - even the flagship if you're lucky - and you get Air Supremacy by default. The small fries should go down immediately and your CA(V)s' double attacks can take out even the battleships, or at the very least moderately damage them, which reduces their attack power enough for them to be a threat anymore.