Keep these things in mind when living in Ikebukuro.
First: Never, ever provoke Shizuo Heiwajima. If you don't believe in bad luck, get accident insurance in advance.
Second: If you have a problem you can't solve, you can try asking the information broker Izaya Orihara for help, but be prepared for him to toy with you.
Third: If you're an action-oriented chuunibyou, join the Dollars. That's your home.
Fourth: If you meet someone at night carrying a knife, a folding knife, a longsword, or a guandao, with red eyes, don't hesitate. Run.
Fifth: If you're lucky enough to meet Lady Kaguya, watch out at all times for the maid who might ambush you from the shadows.
Sixth: The young woman riding the black motorcycle is a good person. She just happens to have no head (literally), so don't be afraid. You'll hurt her feelings.
Seventh: Nobody who graduated from Raira High School is harmless.
This is the surreal everyday life of a half-trained exorcist from the countryside in Ikebukuro.
(The anime characters who appear in this story aren't the people you remember. They're even more... twisted?)