Rymes_
So as a person with depression (clinically diagnosed) I've noticed a lot of people writing depressed Naruto somewhat inaccurately, they basically use the stereotype depression as an example for his depression. I think if Naruto had depression (which he most likely does) he's the type to not shower for weeks, be too physically weak to get out of bed, have no motivation whatsoever and so on, depression isn't all about being sad and lost, it has it's physical effects too and sometimes it's hard not to notice it.
This is not here so you can diagnose yourself, this is purely informative, if you are thinking you may have depression please ask a doctor, a self diagnoses isn't accurate.
The summary: Naruto is feeling rather down in the dumps today when he gets news that his newest mission is going to be a mission the Konoha 12+Sai will go on (ANBU!Naruto|Depressed!Naruto)