THIS IS AN MANGA ONLY DISCUSSION POST. DO NOT DISCUSS ANYTHING BEYOND THIS CHAPTER.
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Let's see... Mai "ex-Misato" knew about Nana's mother and her new family since the very beginning, as she knew Misato Uehara. Can it be that she is a relative to Nana too?
When Nana learns about her mother and her normal family life, it'll be a crush to her. She has been borrowing the sadness of being abandoned deep inside, but now it'll double and come to the surface. Nana will have to meet it face to face. =(
May be, Hachi wil do something at least to soften that bitterness?