"A girl bearing Azure Blaze" I think that's refering to Rin's Granblue Fantasy crossover.
A ghost?Within the welkin long ago, a girl bearing an azure blade-Someone's been watching you?!Hold it.Wait, why's everyone looking at me?Maybe this company is cursed...?A mysterious woman's shadow behind you?!Wait, isn't that...Deremasu
Episode 14 Manga