- End of Summer 2015 Event
- Autumn-themed furniture
- Naval Base Autumn Festival Stall
- Naval Base Autumn Festival Shooting Stall
- "Rabaul Base" Scroll
- "Buin Naval Base" Scroll
- Autumn Voice Lines
- 45 shipgirls: Mochizuki, Oboro, Akebono, Sazanami, Shiratsuyu, Ooshio, Michishio, Arashio, Arare, Kasumi, Hatsukaze, Maikaze, Urakaze, Tanikaze, Hamakaze, Teruzuki, Libeccio, Kazagumo, Umikaze, Kawakaze, Jintsuu, Kinu, Abukuma, Yuubari, Katori, Ooyodo, Furutaka, Myoukou, Nachi, Ashigara, Haguro, Maya, Choukai, Tone, Chikuma, Suzuya, Kumano, Zuihou, Shoukaku, Zuikaku, Katsuragi, Akashi, Akitsushima, Mizuho, Hayasui.
- Ships with Yukata CGs
- New Quests
- Adjustments to some of Mizuho's parameters
- Akashi's Improvement Arsenal menu changes
- New Music/BGM
- Other Updates
- Updated the generic voices for expeditions and finding items for Zuihou Kai, Tanikaze Kai, Hamakaze Kai, and Urakaze Kai.
- Server strengthening/keep up of Rabaul, Buin, Shortland, Palau, Hitokappu, Hashirajima
- Strengthening and changes to measures against illegal connections by illegal tools such as bots and macros.