The Blue Drop: Tenshitachi no Gikyoku anime series is set before the war of the manga series. The storyline starts in 1999, with Mari Wakatake transferring to an all-girl's boarding school called Kaihō Academy (海凰学園 Kaihō Gakuen). Mari's background hides a traumatic past: five years before her arrival at Kaihō, all the inhabitants of the island where she lived died in one night. Mari was the only survivor, but during the accident, lost all her memories prior that point.
At the academy Mari meets Hagino Senkōji, the school idol and class rep. Although Hagino is introduced as a calm and collected person, when she touches Mari's hand she panics and attempts to strangle Mari. From then on, Mari is torn between anger and attraction towards Hagino, who pretends as if nothing had happened.
Unknown to Mari, Hagino is actually the commander of an alien battleship called Blue, which is the vanguard of the invasion to Earth. Blue was seriously damaged and hidden, and Hagino has blended into human society and continued her reconnaissance.
The story focuses on the relationship between Mari and Hagino; as Mari begins to come out of her shell, Hagino, who has been living a double life, gradually begins to have doubts about her mission. As the invasion and war draw closer, they begin to understand each other.
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