Aki is the now deceased wife of Maji in the Captain Harlock series.
Chief Engineer Maji found Aki in the streets with no memory of her past and decided to take her in. After some time, the two fell in love and had a daughter named Midori. Years later, Captain Yamanaka arrived with a revelation that Aki was actually a Mazone, a plant-like race bent on destroying Earth. With her cover blown, Aki tries to assassinate Yamanaka but he kills her before she can finish him off.