Kostja is a poet who's advancing up the ladder of his career and making a name for himself in the Big City.He's not rich by any means, but he's able to live comfortably.
He's got a hard time dealing with his own sexuality and constantly questions himself about it. Not that he'd ever tell anyone about it, least of all the object of his affection.

Feli has lived all his life together with his family and friends in a small village forgotten by society, a village which hasn't followed into what people call "the modern life". He barely knows what electricity is.
He and his cousin Levin left the village in search for something though, and along the way they met up with the somewhat moody Kostja. They also meet a boy named Bastian, and together they all come together to solve the mystery given to Feli and Levin by an unnamed girl.

Bastian is that outsider kid who sits in the library all day long after school, studying languages, which is his biggest hobby and fascination, daydreaming of going abroad.
He's always been a little bullied because of his shyness and language interest. He's considered "nerdy" by his school mates, who sometimes doesn't treat him very nicely.
but despite this, he's a kind kid who's always got a smile up his sleeve.
His interests pay off in the end though, as he stumbles upon Feli and Levin and gets to help them solve their big mystery.

Mio is a young wannabe actor looking for a job in the Big City without much luck, since he has a tendency to overdo his roles quite a bit. People are telling him he's trying too hard, but obviously he refuses to listen. Amateurs!
He's also got a younger twin, named Daichi, whom he was separated from at birth. They found eachother again as teenagers, after quite a bit of research.

I still don't know who this young boy is. All I know is that he's connected to Bastian somehow.