Dakini

Dakini  is a powerful  Mangekyō Sharingan dōjutsu   which strongly influences the target's memory. According to  Kenji , it is a  genjutsu  that gives the user the ability to completely vanish from visual and mental perception momentarily.

Overview
This technique targets the hippocampus--the region of the brain that controls both long-term and short-term memor--by affecting the optic nerve of the target through direct eye contact with the user's Mangekyō Sharingan. By achieving eye contact, the user disturbs the chakra along the optic nerve, allowing this genjutsu to send a command to the hippocampus, causing a specific kind of memory loss--specifically, the ability to erase themselves and their presence from an enemy's mind. 

<span style="font-size:10.5pt;font-family:Meiryo,sans-serif;color:rgb(51,51,51);border:1ptnonewindowtext;padding:0in;">The timeframe of the memory loss is between 5-7 seconds, giving the user only limited time. <span style="font-size:10.5pt;font-family:Helvetica,sans-serif;">

Countermeasures
<p class="MsoNormal" style="margin:4.8pt0in6pt;line-height:16.5pt;"><span style="font-size:10.5pt;font-family:Helvetica,sans-serif;">By understanding how genjustu works, one can easly avoid the effects of Dakini by not making eye contact with the user.