This manga remind me of Komatta Toki Ni Wa Hoshi Ni Kike somehow...
it's the same mangaka, both are fantastic too
I mean Mikiko have the same surname with Reichi and Ren also went to Souryo, that's why...
I think Mikiko is Reichii mother based on the family in Komatta Toki Ni Wa Hoshi Ni Kike... http://www.mangago.zone/read-manga/komatta_toki_ni_wa_hoshi_ni_kike/mf/v10/c003/28/
*family tree
This manga remind me of Komatta Toki Ni Wa Hoshi Ni Kike somehow...
it's the same mangaka, both are fantastic too
I mean Mikiko have the same surname with Reichi and Ren also went to Souryo, that's why...
I think Mikiko is Reichii mother based on the family in Komatta Toki Ni Wa Hoshi Ni Kike...
http://www.mangago.zone/read-manga/komatta_toki_ni_wa_hoshi_ni_kike/mf/v10/c003/28/
*family tree