Diary of a Shipgirl Commander in Training

(The commander in this book is a human, not a shipgirl. The title may be a little misleading.)

The plane Xilin was on crashed. When he opened his eyes again, he found himself in a strange world.

As time passed, Xilin discovered the hidden side of this world. To find a way to survive and fight the Sirens, he had no choice but to navigate between the various factions.

Along the way, the shipgirls and Xilin gradually formed deep bonds.