[@Ninian] 
Oooohh, she's cuteee~ Where'd you find the art?
[s][sup]i just want to pinch her cheeks and ruffle her hair[/sup][/s]

But yeah, a bit of context for the rank:

[quote=http://tokyoghoul.wikia.com/wiki/Ghoul_Investigator]Rank 1 Investigator (一等捜査官, ittō sōsakan): The highest rank for a junior investigator, having gained experience but not yet at the peak of their career. On average, Rank 1 investigators are around twenty-seven years old when they are promoted.
Rank 2 Investigator (二等捜査官, nitō sōsakan): This is the rank at which almost all ghoul investigators begin their career, after graduating from the Ghoul Investigator Training Academy.[/quote]