It's Just Not My Night! Tale of a Fallen Vampire Queen by Shigeyoshi Takagi. A Fantasy manga rated Older Teen, published in English by Seven Seas.
Manamir Bluegarall is a mighty vampire on the verge of conquering the demon world, until her minions botch a teleportation spell and dump her in modern-day Japan. Stripped of her powers and left nearly as weak as a human, the would-be ruler has to take a part-time job at a convenience store just to survive. A fish-out-of-water fantasy comedy.
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