Rainy-Summer 2020 Event/Info

English	Stop the Invasion! Island Defense Reinforcement Operation[Edit]
Japanese	侵攻阻止！島嶼防衛強化作戦
Romaji	Shinkō Soshi! Tōsho-bōē Kyōka sakusen
Start	June 26th 2020	End	August 27th 2020
Scale	Large	New Content	10 ships, 4 equipment, 11 abyssals
Maps	7 Maps (4 Main + 3 EO)	Duration	8 weeks

Difficulty Selection

Each map in this event has four (4) difficulty levels (a.k.a. operation ranks) the player can choose from:

• Casual (丁) (Unlocks at HQ level 1)
• Easy (丙) (Unlocks at HQ level 1)
• Medium/Normal (乙) (Unlocks at HQ level 35)
• Hard (甲) (Unlocks at HQ level 80)

The operation rank affects enemy patterns, boss health and strength, the number of times the player has to sink the boss in order to clear the map and the drop rates of ships. Different ranks reward different medals, pieces of equipment and/or materials upon clearing a map. The higher the operation rank, the better the reward.

However, new ship rewards are available on all difficulty levels, and you only have to clear the final event map on Hard to get the exclusive First-class medal.

Click that option circled in as shown in red to change difficulty

You can choose the difficulty level for each individual map separately. However, you will NOT be able to select Hard for a map if you cleared the previous map on Casual/Easy. You must clear the previous map at least on Medium/Normal.

• 【NOT POSSIBLE】Casual/Easy > Hard
• 【POSSIBLE】(Medium/Normal)/Hard > Hard
• 【POSSIBLE】Casual/Easy/(Medium/Normal)/Hard > (Medium/Normal)
• 【POSSIBLE】Casual/Easy/(Medium/Normal)/Hard > Casual/Easy

Un-highlighted words indicate Current Difficulty

It is also possible to change the difficulty level afterwards, however:

• If you drop to a lower difficulty (e.g. from Hard to Normal/Easy), the current HP/TP bar value (the one you have the moment you drop down) will increase by 25% of the new maximum and you will retain ALL unlocking/phases done on the previous difficulty level.
• However, if you change to a higher difficulty (e.g. from Easy to Hard), the boss's HP/TP bar will be reset upon doing so and ALL unlocking/debuffs/phases will be reset as well. In short, you will lose your entire map progress!

Once the map is cleared (boss HP bar is depleted, boss is defeated, and the HP bar is no longer visible in the map):

• You CAN NO LONGER re-adjust the difficulty level, but can still farm the map on the difficulty you have chosen to clear the map with.
• The enemy patterns revert back to pre-final patterns.

New

Ships

	DD	Usugumo	E-1 Reward
	AS	Jingei	E-2 Drop
	SS	I-47	E-3 Reward
	DE	Kaiboukan No.4	E-4 Drop
	DD	Matsu	E-4 Reward
	DD	Ariake	E-5 Drop
	CL	Helena	E-5 Drop & E-6 Drop
	DE	Yashiro	E-6 Drop & E-7 Drop
	FBB	South Dakota	E-6 Reward
	CV	Hornet	E-7 Reward

Equipment

	Late Model 53cm Bow Torpedo Mount (8 tubes)	Submarine Torpedo	?
	Late Model Submarine Radar & Passive Radiolocator	Submarine Equipment	?
	6inch Triple Rapid Fire Gun Mount Mk.16	Medium Caliber Main Gun	?
	6inch Triple Rapid Fire Gun Mount Mk.16 mod.2	Medium Caliber Main Gun	?

Abyssal

Units

	Destroyer Na-Class 2 new forms	Abyssal Destroyer	Various Encounters
	Abyssal Kuriles Princess 3 normal forms 3 damaged forms	Abyssal Destroyer	E-1 Boss
	Supply Depot Princess B Summer Landing Mode 3 normal forms 3 damaged forms	Abyssal Aviation Battleship (Installation)	E-2 1st Boss
	Gotou Islands Seabed Princess 3 normal forms 3 damaged forms Can be debuffed	Abyssal Submarine	E-3 Boss
	Destroyer Forest Princess 3 normal forms 3 damaged forms Can be debuffed	Abyssal Destroyer	E-4 Final Boss
	Heavy Cruiser Ne-Class 3 new "Kai Summer Mode" forms 1 new "Kai B (II) Summer Mode" form	Abyssal Heavy Cruiser	Various Encounters
	Light Cruiser Princess 4 new "B (II)" forms	Abyssal Light Cruiser	E-5 1st Boss
	Aircraft Carrier Summer Princess 3 new forms 1 new "B (II)" form	Abyssal Standard Aircraft Carrier	Various Encounters In E-7
	Submarine Summer Princess Flagship 2 new "B (II)" forms	Abyssal Submarine	Various Encounters In E-7
	New Southern Battleship Princess 3 normal forms 3 damaged forms Can be debuffed	Abyssal Fast Battleship	E-6 Final Boss
	South Pacific Aircraft Carrier Princess 3 normal forms 3 damaged forms Can be debuffed	Abyssal Standard Aircraft Carrier	E-7 Final Boss

Equipment

	Abyssal 5inch Twin Gun Mount Model A	Small Caliber Main Gun	Abyssal Kuriles Princess equipment
	Abyssal Submarine Electronic Armament	Submarine Equipment	Gotou Islands Seabed Princess equipment
	Abyssal 5inch Single High-angle Gun Mount Kai Ni	Small Caliber Main Gun	Destroyer Forest Princess equipment
	Abyssal 5inch Twin High-angle Gun Mount Kai Ni	Small Caliber Main Gun	Destroyer Forest Princess equipment
	Abyssal Night Operation Aviation Equipment	Large Radar	Aircraft Carrier Summer Princess B equipment
	Abyssal 16inch Triple Gun Mount Mk.6	Medium Caliber Main Gun	New Southern Battleship Princess equipment

Maps

E-1	E-2	E-3	E-4	E-5	E-6	E-7
Teal Tag	Orange Tag	Blue Tag	Green Tag	Purple Tag	Yellow Tag	Gray Tags 1+2+3 (HARD-only)
Single Fleet	Combined Fleet	Single Fleet Combined Fleet	Single Fleet Combined Fleet	Single Fleet Combined Fleet	Combined Fleet	Single Fleet Combined Fleet
TP + HP Gauge	HP + HP Gauge	HP Gauge	TP + TP + HP Gauge	HP + TP Gauge	HP + HP Gauge	HP + HP + HP Gauge
	LBAS	LBAS	LBAS	LBAS	LBAS	LBAS

Click on image of each map to jump to respective subpage directly if you don't want to use tab

Quick Notes

Event Drops

[Edit]	Press [Expand] to see the table, or [Edit] to edit it
☑ Showing old data ☒ Show old data (hidden)
Legend: R = Reward, D = Drop, Empty = not implemented yet/not yet know, N = not found (after implement)
Exclusive Ships	2014	2015 Events				2016 Events				2017 Events				2018 Events		2019 Events				2020 Events
Portrait Name	Fall	Winter	Spring	Summer	Fall	Winter	Spring	Summer	Fall	Winter	Spring	Summer	Fall	Winter	Fall	Winter	Spring	Summer	Fall	Hinamatsuri	Rainy-Summer	Fall
Akizuki	R	N	N	N	D	D	D	D	D	N	D	D	D	D	N	N	D	N	D	N	D	N
Prinz Eugen	R	N	N	N	D	D	N	D	D	N	N	D	N	N	D	N	N	N	N	N	N	D
U-511		R	D	D	D	N	D	N	N	D	N	D	N	N	N	N	N	D	N	N	D	D
Amagi		R	N	N	N	D	D	D	D	N	D	D	N	N	N	N	N	N	D	N	N	N
Katsuragi			R	N	N	N	N	D	N	N	N	N	D	D	N	N	D	N	N	N	N	N
Littorio			R	N	N	N	D	N	N	N	D	D	N	N	D	N	N	D	N	N	N	D
Roma			D	D	D	N	D	N	N	N	D	D	N	N	D	N	N	D	N	N	N	N
Teruzuki				R	N	N	D	N	N	D	N	D	D	N	N	D	D	N	D	N	D	N
Graf Zeppelin					D	D	D	N	N	N	N	D	N	D	D	N	N	N	N	N	D	D
Hatsuzuki						R	N	N	D	N	N	N	N	N	D	N	N	N	D	N	D	D
Iowa							R	N	N	N	N	N	N	D	N	N	D	N	N	N	N	N
Pola							R	N	D	N	N	D	N	N	D	N	N	D	N	N	N	N
Harukaze							D	N	D	D	D	D	D	D	N	N	N	N	D	N	N	D
Aquila								D	N	N	N	D	N	N	D	N	N	D	N	N	N	D
I-26								D	N	D	N	N	N	N	D	N	N	D	D	N	D	N
Commandant Teste									R	N	N	D	N	N	D	N	D	D	N	N	N	D
Matsukaze										R	N	N	N	D	D	N	N	N	D	N	D	D
I-14										R	N	N	N	N	D	N	N	N	N	N	D	N
I-13										D	D	N	N	N	D	N	N	N	D	N	D	N
Kasuga Maru											R	N	D	D	D	D	D	N	D	N	D	D
Gangut											R	N	N	D	N	N	D	N	N	N	D	D
Shimushu											D	N	D	D	D	D	D	N	N	N	D	D
Kunashiri											D	N	D	D	D	D	D	N	D	N	D	N
Etorofu											D	D	D	D	D	D	D	D	D	D	D	N
Hatakaze												R	N	D	N	N	N	N	D	N	D	D
Richelieu												R	N	D	D	N	N	D	N	D	N	D
Luigi Torelli												D	N	D	D	N	D	D	N	N	D	D
Matsuwa												D	D	D	D	N	D	N	D	D	D	D
Suzutsuki													R	N	N	D	D	N	N	N	D	N
Sado													R	D	D	N	D	D	D	D	D	D
Tsushima													D	D	D	D	D	D	D	D	D	D
I-400													D	N	D	N	D	N	N	N	D	N
Gambier Bay														R	N	N	D	N	N	D	D	D
Intrepid														R	N	N	D	N	N	N	N	N
Hiburi														R	D	D	D	D	D	N	D	D
Daitou														D	D	D	D	D	D	N	D	D
Jervis														D	N	N	N	D	N	N	N	D
Hamanami														D	N	D	D	D	D	D	D	D
Tashkent														D	N	N	D	D	N	N	D	D
Samuel B. Roberts															N	N	D	N	N	D	N	N
Fukae															D	D	D	D	D	D	D	N
Shinyou															R	N	D	D	D	N	D	D
Maestrale															R	N	N	D	N	N	N	N
Nelson															R	N	N	D	N	N	N	D
Gotland															D	D	D	D	N	D	N	D
Minegumo																R	N	D	D	D	D	N
Nisshin																R	N	N	N	N	D	N
Hayanami																D	D	D	D	D	D	D
Johnston																D	D	D	N	N	D	N
Giuseppe Garibaldi																	R	N	N	N	N	D
Colorado																	R	N	N	N	N	D
Hachijou																	R	N	D	N	D	N
Ishigaki																	D	N	D	N	D	N
Fletcher																	D	N	D	N	D	N
Duca degli Abruzzi																		R	N	N	N	N
Janus																		R	N	N	N	D
Mikura																		D	D	N	D	N
Grecale																		D	N	N	N	D
Perth																			R	N	D	D
Shinshuu Maru																			R	N	N	D
Atlanta																			R	N	N	N
De Ruyter																			D	N	D	N
Houston																			D	N	D	N
Hirato																			D	D	D	N
Akishimo																			D	N	D	N
Usugumo																					R	N
I-47																					R	N
Matsu																					R	N
South Dakota																					R	N
Hornet																					R	N
Jingei																					D	D
Kaiboukan No.4																					D	D
Ariake																					D	N
Helena																					D	N
Yashiro																					D	N
Washington																						R
Take																						R
Scirocco																						D
Sheffield																						D
Portrait Name	Fall	Winter	Spring	Summer	Fall	Winter	Spring	Summer	Fall	Winter	Spring	Summer	Fall	Winter	Fall	Winter	Spring	Summer	Fall	Hinamatsuri	Rainy-Summer	Fall
Exclusive Ships	2014	2015 Events				2016 Events				2017 Events				2018 Events		2019 Events				2020 Events
This table includes all ships that are currently unavailable outside of events.