The Never-Returning Mage in a Wheelchair

My name is Jiuyan. Just waking up from amnesia, I immediately lost my legs. Accompanying me is only an ancient tome with all its words melted away, Xiaojiu. But fortunately, I was picked up from the wilderness by a girl who gets along well with me, and in an ordinary village, I engage in ordinary magic teaching. Ridiculously, a mage who cannot cast magic is teaching others magic. But this kind of life seems nice, except that I only have a month and a half left in my remaining life...