Episodes 16.5 and 20.5.

Glass no Kantai Special episodes focus on the history behind the Imperial Royal Family, recounting the events that happened before the TV Series.

A revolution stirs in the dark reaches of space. Michel Volban leads The People’s Army against the oppression of self-proclaimed Holy Emperor, Vetti Sforza. Just as it appears the rebellion will be crushed, a hero arrives to join the fight. Pirate Cleo Corbeille—the last of the fallen Royal Family—steers his sleek battleship into battle and brings new hope that freedom can be obtained.
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(Source: Crunchyroll)

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