it looks like something metal cracking inside a black zippered up thing, but i can't make out exactly WHAT.

and there are katakana in there too. i just recognize the letter "i" though.

ooh it's the trident in chrome's bag. it's beside her italian language learning book. thank you, anime ♥

...i just realized, what the hell, kokuyou allows little girls to carry deadly weapons into school premises? WHEN CAN I ENROLL <3

It's Chrome's ba-- oh wait, you figured it out :'D;

XDDD