Spica's Smiles: As the cover art suggests, Spica wears a mask most of the time. She's like an always smiling convenience store clerk. But for the convo with grandma at the end of the previous arc, we were seeing her real expressions. And it may be that's she's giving a real smile to this guy too. So she might be vulnerable to this guy - and maybe that's what grandma is worried about.
(Actually cover art goes farther -- it suggests that she's substantially dead/miserable under her mask.)
(Actually cover art goes farther -- it suggests that she's substantially dead/miserable under her mask.)