In Brynhildr of the Darkness, a lab is creating "Witches", girls with various powers they plan to use for nefarious purposes. Some of the Witches have escaped.
In episode 9, lab agent Kurofuku is out with Nanami, one of the non-escaped witches. She has the ability to scan people's memories and erase them (and surprise! also implant false memories.)
At one point, a couple of jerks start hitting on Nanami; they know nothing she needs, so she erases one's memories of everything after age 5. "Now he's a five year old who needs a shave."
Here's a youtube _link_; it's about 4-5 minutes in. https://www.youtube.com/watch?v=az5hBx6m_-U