502nd, Sister Aces are Taking Off?

Striker engine sound suddenly echoes at 502 base. It was Takami Karibuchi who finally rushed from Fuso! Hikari is pleased with the reunion after a long absence. The members of the 502 unit also welcome Takami as a new member, but Takami has some special circumstances. What is the situation? And what is the fate of Hikari Karibuchi and Takami sisters ...?