"Kakeru Kurosawa is an antisocial junior high school student. He rarely associates with his classmates, and he looks down on them; but this behavior is topped off by a certain bad habit, his closely guarded secret: Every day after school, he sneaks in to the rarely used girls' toilet on the 3rd floor and masturbates in a stall. Kakeru's shadowy routine remains undisturbed until one day, when a diminutive girl from his class, Aya Kitahara, almost discovers him. Their meeting begins a coming-of-age story dealing with blackmail, bullying, revenge, heartbreak and ultimately, redemption." - Anime News Network
"Jio is a young boy interested in achieving one thing: to conquer the world. He meets the treasure hunter Ruby Crescent and soon learns about the amazing weapons O-Parts and those who are able to use these weapons O.P.T.S. Jio 's dark and lonely past lead him to trust nothing in the world except for money and himself however he later finds himself travelling with Ruby (rather reluctantly) as her bodyguard. After a short time together, Jio and Ruby part ways (as Ruby runs out of money to pay Jio for being a bodyguard) but almost immediantly Ruby is kidnapped by the man with 666 on his forehead, Satan. Jio attempts to rescue Ruby, realizing that he himself is a O.P.T.S. but is beaten quickly by a strong O-Part. Immediantly after this, the numbers 666 appear on Jio's forehead, revealing that Jio is the real devil Satan and instantly defeats the fake Satan. Jio decides to continue travelling with Ruby until she can pay him for being a bodyguard." - Anime News Network
"This story starts by introducing Yoshina Ageha, a high school student that seems to like helping people. Whatever problems anyone should have, he will solve them for a sum of 10,000 yen. One night, on his way home, Ageha found a ringing public phone and answered it. A red telephone card written "Psyren" on it came out of the card slot and as he took it, a strange woman voice in the phone, who seemed to know much about Ageha, asked a bunch of questions, and as he walked away with the card that will take him away to strange places."