CH.1 - YUNI-SAN: Kaoru is a boy with a tough home life and almost no one to care for him. While wandering the streets alone one night he happens to meet a man -- a foreigner named Yuni, who shows Kaoru that friendship and love do exist.

CH.2 - KAERU-KUN: In middle school, a new student, Nagare KAE, nicknamed "Kaeru-kun" against his will, feels like an outcast because of his name. Kae skips school in favor of video games; however, at the arcade he meets his classmate Kaoru, whom he unwittingly befriends.

CH.3 - SHUU Part 1: Now in high school, Kaoru's friend Yuu insists on bringing him to his house near every day. Kaoru meets Shuu, Yuu's older brother, who intrigues him. Curious from the things Yuu's said about his brother, Kaoru confronts Shuu about relationships...

English version via Renta!

Taken from Wikipedia and Dangerous Pleasure:
After being devastated in the third World War (known as The Third Division), Japan was divided in two. Several years after the end of the war, a crime organization called Vischio has taken control of the destroyed city of Toshima (formerly Tokyo, Japan's capital city), where they are holding a battle game known as "Igura". The main character, a young man named Akira, is falsely accused of a crime. Once arrested, a mysterious woman appears before him, offering him freedom if he agrees to participate in Igura and defeat Igura's strongest man: the king, or "Il-re". The story follows Akira's life in the harsh, lawless Toshima as he fights both to survive and to unravel the mysteries developing around him.

Kinda creepy. Dante, the main character, is fighting various characters to keep the passage to the demon world sealed, but he doesn't seem to be having much luck... (And the story says 'To be continued' at the end, so there might be more to it.)