So much plot progress, I expected it would take longer for Shirosawa to spill the beans... Sakura's core should definitely be within Shamiko, the story flow strongly points there. After realizing that I imagine next would come trying to find the dispersed parts... Can Shamiko find a way to talk with Sakura? given that apparently she once talked with her.
Anyway, maybe I laughed a bit too much at Shirosawa's literal flight attempt... and Lico giving it an obvious pass. I'm finding that overreacting tapir quite funny.
@Madcat6204
Maybe the barrier that prevents demons and magical girls from meeting is still functioning and preventing her from being there. It perhaps would not work with Momo anymore since she already met them, or cause she crossed the barrier once already while Mikan did neither... Of course, maybe I'm overthinking, it shouldn't take long till we know more.
@chris_dftba
In chapter 25, Seiko said Shamiko barely made it thanks to Sakura tampering with the seal. There was also a mention of Joshua starting to help Sakura once they knew Shamiko was going to survive. Shamiko was without doubt at death's door...
Which is what gives it a whole new meaning once it's revealed the narrator is her father, and that he used to say "Ganbare!" to her all the time. Incidentally, this is also why translating "Ganbare!" as "Hang in there!/Don't give up!" fits better this story rather than "Give your best!" (as Ganbare kinda means all that)
@BugDemon
Given how tight are the foreshadows here, maybe Sakura fought the "Baphomet that lost it's heart" that Mikan imagined... which might also be related to the one her father summoned.