The user is capable of erasing memories relating to the witches of their targets. The total memories that are erased appears to be back to when the victim crossed path or knew about the first witch. On a Witch Killer however, it erases the memories of those who met the target aside from the Seventh Witch, other Witch Killers and Spotters. It also possible for people to regain their total memories if the power was forcibly removed from the current user, such as during the ceremony as shown where Ryu wished that all the powers of Rika's set would disappear through the ceremony.
This power also overlay on other powers. It also overlays on other erased memories from other seventh witches of another set. Nancy's variation also allows her to rearrange the memory as she wishes by switching the people in it, though this was shown when she had less control on the accuracy. Rika's variant seems to also allow her to replace people in the memories as well, though this was after an attempt to erase Shinichi and Ryu's memories.
The Amnesia power doesn't work on people who aren't in the campus, as shown by Leona who had been hiding from Rika. The user can also do a mass erasure of memories on the entire student body, such as when Ushio erased the memory of Nene's speech during the election day.
Each time the user uses their power, they will be forgotten by everyone. If the user is not adapted at using the power, then there is a risk of the memory that was manipulated to be changed into something undesired. In addition, the power cannot be used to erase the memories of people that are outside the campus at time that it is being used, as shown through Leona who was able to evade the Amnesia power twice.
In the case of two Witch Killers having the same Seventh Witch's power then they both will be erased from the memories of others due to their link.
* - was casted via erasing a Witch Killer.
- ↑ Yamada-kun to Nananin no Majo Manga: Chapter 172
|First Witch||Body Swapping|
|Second Witch||Charm • Submission • Provocation|
|Third Witch||Telepathy • Mind Reading • Mind Control|
|Fourth Witch||Premonition • Foresight|
|Fifth Witch||Retrospective • Memory Dive • Romance|
|Sixth Witch||Invisibility • Personality Hide|
|Seventh Witch||Amnesia • Power Detection • Witch Detection|
|Witch Killers||Copy • Plunder|