Memory erasing NPC

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

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

Lust Friend
The Senior Sister Succubus in Lust Friend removes 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.

Succubus Puttel
The Apprentice Succubus of Succubus Puttel removes memories in exchange for 1 level.

Succubus in Wonderland
In Succubus in Wonderland, the red crystal ball in Hatter's shop can remove memories in exchange for half of the player's current muni. The crystal ball can also make the player character a virgin again, for the same cost.

LustGrimm Again
The Suspicious Mage returns in LustGrimm Again. They still erase memories, set Lust to 0 and reduce Dependence by 1 point, but now they also reset the player's virginity if it has been lost. The cost is still a Grimm Crystal.

Demon in Wonderland
One of the functions of Cheshire Crystals in Demon in Wonderland is to erase the player's memories in exchange for a Trump Crystal.