First-year high school student Ageha Yashina runs a jack-of-all-trades business, solving cases by helping people. But in reality, he's just an empty boy who only wants a reason to cause trouble. Ageha finds a suspicious telephone card at a public phone booth he passes by. It's the same one his childhood friend, Sakurako Amamiya, had... Afterwards, Amamiya disappears, leaving Ageha with the words, "Help me..." Ageha investigates the card and stumbles upon a certain urban legend: "The secret society Siren and its messenger, the mysterious Nemesis Q, will lead humanity to paradise..." Ageha scoffs at the rumor, but mysterious assassins appear, after the card. Ageha is cornered... The next moment he answers a ringing phone for help, he finds himself transported to an unfamiliar wasteland.
