The Amazing Adventures of Battleship: 1936

When she woke up, she was lying on the Arctic ice sheet. There is a battleship parked nearby. A cat squatted at his feet. "Hello host," the cat said, "I am your system." She stared at the cat for ten seconds. "Am I still dreaming?" "No." "Then why am I here?" "I don't know." "... You are the system and you tell me you don't know?" "Meow." When the North Sea Fleet patrol picked her up, the entire base was watching the ship. "Ship girl? What is it?" "Never heard of it." "Where did this boat come from?" "She said she didn't know either." "Then what does she know?" "... At present, I don't know much about anything." She really didn't know anything. I don't know why I traveled through time, I don't know why this world is completely different from the history in my memory, I don't know where the unmanned fleet called "Siren" came from, and I don't know why 28 countries suddenly decided to form a joint fleet. All she knew was that the cat was indeed her system. Because every time when she was most confused, he would pat her legs with his paws and say: "Don't look at me, I don't know either."