Achika Masaki (柾木 阿知花, Masaki Achika) is a fictional character in the Tenchi Muyo! anime series. She is an original creation of first OVA series' co-writer Naoko Hasegawa, making her animated debut in the 1996 feature Tenchi Muyo! in Love. She was the wife of Nobuyuki, the daughter of Katsuhito Masaki (Yosho), and the mother of Tenchi. In the Ryo-Ohki OVA series her name is Kiyone Masaki and she only appears in flashback that Tenchi Masaki has. Her appearance in the Ryo-Ohki OVA is identical to that of Tennyo Masaki.