I Joined the Army in My Sister's Place in a Matriarchal World, and Now They're All Eyeing Me

To repel an invasion by a powerful neighboring country, the Kingdom of Catis conscripts soldiers for war. But when Will's cowardly older sister receives her draft notice, she flees in the middle of the night and vanishes without a trace.

With no other choice, Will takes his sister's place in the army and enlists. There, he becomes a comrade-in-arms with three young women around his age.

But the commander's "brilliant strategy" leads them into a desperate situation, and out of a thousand soldiers, only Will and his three companions survive.

Exhausted, the four of them unexpectedly discover a hot spring amid the vast, snow-covered mountains.

While his companions enjoy the hot spring, Will stands guard. But a monster attacks him, exposing his secret: he enlisted in his sister's place.

How will the three young women react when they discover the truth?

Alyushia: "I hope you won't forget my voice, my name, my feelings, or the things I've said to you."

Cornelia: "From now on, let me protect you!"

Emilia: "We agreed to keep this secret together... Why are you..."