ヴァンパイアクルセイダーズ

The story is set in Colony 214
, the East Asian Governing Region. "Kudo Liquaria"
was newly appointed as the colony's ruler and to capture Avalon Island, a base for humanity fleeing from rule.
A few days before Kudo's arrival, the colony was destroyed in a human rebellion.
Kudo's sister, Elfina Liquaria, who originally ruled the colony,
also went missing.
Elfina had disappeared just before the rebellion broke out in the colony.
To gather information and find clues about his missing sister, Kudo infiltrates Avalon Island.
Transforming into a human, he is accompanied by his robotic caretaker, the "Able Servant."