"Kenji is your typical teenage misfit. He's good at math, bad with girls, and spends most of his time hanging out in the all-powerful, online community known as OZ. His second life is the only life he has - until the girl of his dreams, Natsuki, hijacks him for a starring role as a fake fiancé at her family reunion. Things only get stranger from there. A late-night email containing a cryptic mathematic riddle leads to the unleashing of a rogue AI"--Container....

After his family moves from Tokyo to a small fishing village, teenager Kai spends his days sulking and adrift. When his classmates invite him to play keyboard in their band, their jam sessions bring an unexpected guest: Lu, a young mermaid whose fins turn to feet when she hears the beats, and whose singing causes humans to compulsively dance. But when an ancient prophecy threatens Lu and the village, Kai and his new friends must save the day in this...