Aka

In the desert region of Rayland, there stood a mansion. Inhabited were Aramis, a young girl known as "Ruta's Familiar," and her guardian, the young man Kaden. Aramis had been granted the power by Ruta since childhood—the ability to erase the memories of others, hence the title "Restorer." Due to their duties as Familiars, the two frequently received instructions from Ruta to erase the memories of designated individuals. It wasn't until Aramis encountered another "Restorer" like herself that she began to question this practice, and her belief in her own altruistic purpose began to waver. Seeing this, Kaden, who was watching over her, couldn't help but worry for her…

Résumé

Aka is an erotic visual novel developed by NekoNekoSoft.

Desert lands in the ancient times. There was a legend about entity called Ruta who bestows various magic-like abilities upon his disciples along with vermillion gems.
Story begins to unfold with the adventure of two people -- Aramis, young girl from the Ruta clan, who can erase people's memories, and Kadan, her guardian.

There are four chapter in the novel, that are connected by the same setting.