The film adapts and expands the Planetarian visual novel by Key. The story is set in a dystopian future where biological and nuclear warfare has left a once prosperous civilization in complete ruin. The film tells the story of an old man travelling around with a mobile planetarium projector to show people the stars.
The new OVA will feature the prequel short story "Snow Globe," which debuted as part of a light novel volume that bundled with a limited-edition version of the original PC game.
The anime adaptation of Key's visual novel Kud Wafter, which follows the romantic relationship between Riki Naoe and Kudryavka Noumi from the game Little Busters!
A national concert tour featuring LiSA titled "Girls Dead Monster starring LiSA Tour 2010: Keep The Angel Beats!" was held across Japan August 3 and September 2, 2010; all of the venues ultimately sold out. A BD/DVD video album box set titled Girls Dead Monster starring LiSA Tour 2010 Final: Keep The Angel Beats! of the tour's final performance was released on June 1, 2011 by Key Sounds Label bearing the catalog numbers KSLV-0001–0003. The last concert of Girls Dead Monster was held on December 27, 2010 at an event called "Girls Dead Monster Last Live: Final Operation" featuring Marina and LiSA at the Tokyo International Forum.
