The manga series Gunslinger Girl, written and illustrated by Yu Aida, was first published in Japan.
The first season of the Gunslinger Girl anime adaptation aired in Japan, bringing the manga series to a wider audience.
The second season of the Gunslinger Girl anime, titled Gunslinger Girl: Il Teatrino, premiered in Japan as a continuation of the story.
Season 1 was one of my favorite anime binges in a long time. Such a fun mix of thoughtfulness (movement through time), silliness, and cool scenes (The Ruins of The King's Tomb). I can't wait to watch season 2. I know it's airing as I write this, but I like taking in entire seasons at once if I can manage it.