I love how you can fit a flashback so naturally with the grandma and the stars. This is something even good writers struggle with yet this manga has done it several times over.
Man this manga is epic I mean how the characters get better throughout each chapter and we come to know about them more the mangaka has thought something brilliant here.
I love that Miyagi's expression changes overtime. When we first met her, she looks apathetic, now she's smiling in every single panel. Wonderful development in the littlest of things.