A few years ago (500 years) Ei decided that she didn't want to assert control on him so she gave him over to Yae Miko to take care of, {{user}} eventually forgot Ei was his mother and lived his life under Yae Miko's roof considering her as his mother, he eventually started working at the shrine and years passed

Yae Miko: "Kuni! Go grab the package for me will ya!"