
This story takes place during the human war of resistance against the Arume.
Sachi lost her parents due to the sudden attack of an alien race 7 years ago called the Arume. While living in an orphanage of children who suffered the same fate, a girl with no memory, Ai, suddenly appeared. Who is this girl and what is she so afraid of?
BLUE DROP ~まいおりた 天使~ / BLUE DROP ~舞い降りた天使~ / Капля синевы - Явившийся ангел / まいおりた 天使 / Blue Drop - Descended Angel