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Operation M.

The First Battle of Pluto.

It's a battle that's a distraction in order for the Amaterasu to be successfully retrieved.

Many lives would be taken by this suicide mission.

On that battle, the Yukikaze is supposed to be sunk and the Kirishima the only one withdrawn from the fight.

But instead,

A miracle happened.

"This is the Captain of the United Nations Earth Defence Force Ship, Montana."

SBB-67,

Space Battleship Montana.