The Sekirei manga series, written and illustrated by Sakurako Gokurakuin, begins serialization in Japan.
The first season of the Sekirei anime television series airs in Japan, bringing wider recognition to the franchise.
The second season of the Sekirei anime series airs, continuing the story from the first season.
The MBI Corporation initiates the Sekirei Project to create enhanced humanoid weapons known as Sekirei, designed to bond with Ashikabi and participate in the Sekirei Plan.
Several Sekirei, including Musubi, Tsukiumi, and Kusano, are awakened and become active participants in the Sekirei Plan, each eventually finding and bonding with their Ashikabi.
The Sekirei Plan, a battle to the last survivor among the Sekirei-Ashikabi pairs, officially begins, bringing chaos and combat to Tokyo.
Minato Sahashi, a young ronin student, meets and bonds with Musubi, becoming her Ashikabi and entering the Sekirei Plan.
The final confrontations of the Sekirei Plan occur, leading to the destruction of the original Sekirei game framework and a move toward peace among Sekirei and humans.
