The show starts with Kinji attending the assault class with his old classmates teasing him. The teasing ends when Aria appeared though, it seems like they were afraid of her or at least dislike her for being ranked S due to having a large gap in their abilities. Kinji comments how she is always going solo just like her name implies. Aria is a vocal piece in an opera that is sung in solo. Honestly though, this is the first time I heard this so I just learned something new.
|>:3 It's a lion! Get in the car!|
Kinji goes home and see that his wrist watch is off compared to his wall clock and alarm clock so he set it 5 minutes back. Now this is something suspicious, someone must have entered his room to change the time but who could it be?
|No, Kinji... You are the criminal!|
The episode ends with Aria being pretty much disappointed at Kinji for not doing anything helpful, heck he can't even protect himself from the attacker. What a wuss!