Japanese

The movie starts off after the events of Episode 3, when Kisaragi had sunk. Mikawa Fleet (Furutaka, Aoba, Kako, Kinugasa, Tenryuu) are in the middle of Night Battle. Choukai uses Searchlight but gets Medium damaged, but they win in the end. A New Ship Girls gets "Dropped", emerging from the sea. It is Kisaragi. Kisaragi is brought back to the temporary base in Solomon Islands, but she is suffering from PTSD and has amnesia, unable to remember anyone from back in the anime, excluding Mutsuki. Meanwhile, the fleet celebrates their victory of the Ironbottom sound campaign. During the time Kisaragi slowly starts turning into an Abyssal, but she is still able to retain her consciousness and starts crying. Seeing the situation, Kaga finally reveals the secret: At the start of this war, there were two factions, Ship Girls and Abyssals. Both fights for an unknown reason, but if Ship Girls sink, they become abyssals, but the vice versa can happen where a sunk Abyssal can turn into a Ship Girl. There is this crimson aura in some areas in the ocean, which indicates a source of heavy Abyssal power resides in there. (See Extra Operation Event maps) Any Ship Girls who were originally Abyssals become disabled and equipment malfunctions whenever they enter this Crimson Sea. Kaga was originally an Abysssal and retains her memory as an Abyssal. The Fleet decides to investigate and commences an operation, consisting of 4 task forces, where the true goal was to escort Fubuki into this dark portal in the middle of the Crimson Sea, which is a source of the Abyssals' power. (This portal looks practically the same as the final map in PS VITA KanColle Kai) Several battles occur, where several ship girls become heavily damaged from battle but no one gets sunk. When they arrive at the Dark Portal, only Yamato, Mutsuki and Fubuki remains. Yamato and Mutsuki becomes Heavily Damaged from battle but out of no where, half-transformed Abyssal Kisaragi comes to their aid, and Fubuki takes the chance to jump into the Dark Portal. It is actually revealed that this area was the place where the actual IJN Destroyer Fubuki got sunk in 1942 (Cape Esperance, the infamous 'Ware-Aoba'). The secret is revealed, and that when all of the Ships sunk during back in World War II, their Souls left the ships, wandering around the sea, while constantly switching back and forth from Abyssals to Ship Girls. Fubuki meets her Dark Persona, an Abyssal Fubuki, who tries to persuade Fubuki into becoming an Abyssal. Fubuki refuses, and both go through a mental breakdown through a Mind Battle. Afterwards the Dark Portal disappears. Similar to when an Event map is cleared. Abyssals disappear from the area, but Abyssal Kisaragi disappears as well, while exchanging few last words with Mutsuki.