Rika Saionji (formerly)
Nancy (formerly)
Rui Takuma
Ryu Yamada (through Duplication; formerly)
Ushio Igarashi (through Grasp)

Amnesia is a Witch Power.


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.[1]


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.

Sharing Powers

Ushio and Ryu linked.

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.

Casted Spells

Name Casted By Status
Haruma YamazakiRika SaionjiRemoved
Urara ShiraishiRika Saionji*Removed
Toranosuke MiyamuraRika Saionji*Removed
Miyabi ItoRika Saionji*Removed
Kentaro TsubakiRika Saionji*Removed
Nene OdagiriRika Saionji*Returned
Ushio IgarashiRika Saionji*Removed
Karen KimishimaRika Saionji*Removed
Rin SasakiRika Saionji*Removed
Meiko OtsukaRika Saionji*Returned
Hideaki TsurukawaRika Saionji*Removed
Mitsuru KamedaRika Saionji*Removed
Maria SarushimaRika Saionji*Returned
Noa TakigawaRika Saionji*Returned
Saeko FukazawaRika Saionji*Removed
Keigo ShibutaniRika Saionji*Removed
Ren AsanoRika Saionji*Removed
Leona MiyamuraRika SaionjiRemoved
Rui TakumaNancyReturned
Ryu YamadaNancyReturned
Nene OdagiriNancyReturned
Ushio IgarashiNancyReturned
Sora HimekawaNancyReturned
The Student BodyUshio IgarashiActive
Nene OdagiriUshio IgarashiActive
Toranosuke MiyamuraUshio IgarashiReturned
Urara ShiraishiUshio IgarashiReturned
Miyabi ItoUshio IgarashiReturned
Kentaro TsubakiUshio IgarashiReturned
Yuri MiuraUshio IgarashiActive
Kaori YasojimaUshio IgarashiActive
Mutta HagiwaraUshio IgarashiActive
Masamune IchijoUshio IgarashiActive
NancyUshio IgarashiActive
SidUshio IgarashiActive
Jin KurosakiUshio IgarashiActive
Midori ArisugawaUshio IgarashiActive
Tsubasa KonnoUshio IgarashiActive
Kotori MoegiUshio IgarashiActive
Momoko SeishuinUshio IgarashiActive
Aiko ChikushiUshio IgarashiActive

* - was casted via erasing a Witch Killer.


  1. Yamada-kun to Nananin no Majo Manga: Chapter 172


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