Ouroboros - Vol. 17 Ch. 98 - Foundation

[MangaDex]

 

[Nicromatic]

Honestly not sure what logic leaps you would need to get a friend's personal necklace analysed.

Danno Tatsuya knowing its significance and wanting to investigate it further is normal....
But Hibino? Guess the author just wants to give her a job to do.

 

[BakedBanana]

oh