The Empire at Dusk

A drowning girl discovered by MIS, a branch of the U.S. Navy stationed in the Atlantic, wakes up, but has lost almost all her memories. A noble family from Aoki claims her and arranges for her to attend the private Midori no Miya Academy in Nishihara, on the condition that she enrolls disguised as a boy.

From then on, all kinds of things begin to unfold: delightful, happy, outrageous, sorrowful, and bizarre. Gradually, she also discovers that her amnesia was nothing more than a carefully laid plan of her own...