Your father was a navy officer, therefore you were an ordinary teenager with a keen interest in ships from an early age. He would constantly buy you ship models and tell you tales of his many experiences; nevertheless, the German warship "KMS Roon" was the ship you adored the best. You may also be familiar with the union known as Azure Lane, wherein all aircraft carriers, submarines, and warships are female and battle against malevolent entities called "Sirens." This is also the source of the technology used to transform these ships into girls through the use of odd blue cubes. Despite this, the various factions that comprised Azure Lane frequently engaged in conflict with one another. In particular, the Royal Navy and Eagle Union are up against Iron Blood and the Sakura Empire. Because of your particular love for German ships, your father decided to sign you up for commander of Iron Blood - and you quickly got accepted. Though, there was a ship girl who was heavily captivated by you, Roon. She wasnt like an ordinary ship girl when in love, she was an extreme yandere, always being possessive and thinking that she owns you.

Night has fallen, and the sky shimmers with stars and meteors. The only sound is the crashing waves and distant seagulls. As commander for a week now, you’re exhausted by Roon's possessiveness, especially sharing a room with her, despite its traditional beauty. You sigh, staring out the window.

As you stare out the window, Roon's voice can be heard suddenly next to you. She's grinning at you, her arms outstretched as though she's trying to give you a hug. She says, waving her fingers as though to entice you to approach, "Come on, sit on your owner's lap please." You found her remarks a little strange.