The unaired 13th episode of Sekai Seifuku: Bouryaku no Zvezda that is included in Volume 7 of the BD/DVD. In this special, Kate and company will launch their own idol unit. (Source: Crunchyroll)

The world's greatest assassin had sworn lifelong allegiance to the organization that raised him. However, despite his loyalty, that very same organization takes action to silence him, ultimately leading to his demise. Drowning in frustration and regrets he can no longer suppress, he finds himself in an audience with a goddess attracted by his exceptional skills. The goddess offers him reincarnation into a magnificent world of swords and magic so he can perform a crucial mission: prevent that world's destruction by slaying its hero. Accepting the goddess' request, he is reborn as Lugh Tuatha Dé, the son of a noble family of assassins serving the Alvan Kingdom. Under the guidance of his father, Lugh learns new assassination techniques that significantly differ from the cold-blooded and unsympathetic killing style of his previous life. Furthermore, his other talents bloom, allowing him to meet new allies and acquaintances. Even so, Lugh knows that his efforts are far from adequate, because a monumental adversary such as the hero can only be defeated with perfection.

Asuta Jimon, a runaway, is wandering the streets at night when he has a chance encounter with a young girl collapsed beside her tricycle. After he offers her some food, she is moved by his kindness and asks him to join her organization, offering him a face mask and a sweet bun. In need of a place to stay, Asuta decides to play along and accepts her offer, adopting the nickname Dva. Little does Dva know, this cute girl is Kate Hoshimiya, the leader of Zvezda, a secret organization bent on world conquest. However, he soon realizes the true weight of her words as peculiar happenings rope him deeper into Zvezda and its eccentric members—the samurai-like vanguard Itsuka Shikabane, tech-genius Natalia Natasha Vasylchenko, troublesome Yasubee Yasu Morozumi, ex-gangster Gorou Shikabane, and multi-purpose robot Roboko Tsujii. With White Light, a powerful organization of justice, and the entire Japanese government against them, can Zvezda really dominate all humanity and let their light shine throughout the world?

The story is set during the middle of Japan's historic Edo period. It centers around Toriyama Sekiei, an eccentric but brilliant artist who only draws supernatural creatures—because he draws the creatures he actually encounters in his life.