World Witches Take Off! S01 E12 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 ...?