Memory erasing NPC

Throughout the games, there are various NPCs who will remove the main character's memories of being defeated by succubi, but for a cost.

Lust Grimm
The Suspicious Mage in Lust Grimm removes your memories in exchange for a Grimm Crystal. This also sets your Lust to zero and reduces your Dependence by one point.

Lust Friend
The Senior Sister Succubus in Lust Friend removes your memories in exchange for a Rosary of Memory. Unlike the memory-erasers of other games, she only occurs in one location: a hut in Fess Town.