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?

Sequels:

> Blue Drop
( https://bato.to/comic/_/comics/blue-drop-r4104 )
> Blue Drop Tenshi no Bokura
( https://bato.to/comic/_/comics/blue-drop-tenshi-no-bokura-r10497 )
> Blue Drop Tenshi no Itazura
( https://bato.to/comic/_/comics/blue-drop-tenshi-no-itazura-r6274 )