Ayu Higashi

The setting is the town of Tanabe in the central prefecture of Wakayama. Four schoolgirls are fast friends. However, when Risa, Mika, and Maki die in a car accident Natsumi is alone, isolated, and listless both at school and socially. When the three friends return, however, Natsumi is alone no longer.

Midorikawa Ran, at the age of 24, has made her fortune off of the financial market and has since retired. She spends her days online in chat rooms and gaming, while her younger sister Hikaru, aka Pandora, takes care of the household duties. Ran is comfortable with her situation but Hikaru realizes that they can't continue their lifestyle like this and decides to work at a maid café. As the overprotective sister, Ran becomes worried and joins Hikaru at the maid café on a daily basis.

A mysterious care facility owned by the Amazon extermination organization is pursuing Haruka Misuzawa. All come together in a tale of symbiosis and competition, and an end to the troubles and conflicts of the Riders.

Follows a mysterious Amazon hunter named Jin Takayama, the heavily-sheltered Haruka Mizusawa, and the Nozama Pest Control Service, a small group of mercenaries as they hunt down the awakening Amazons.