Chaos Theory (Cosmic Lovely)

Kali doesn't know what to make of Blue. His scientific knowledge surpasses genius, and his understanding of the universe is effortless. His mind intrigues her, and his body attracts her in the worst way. Fascinated, Kali accepts when he asks her on a date ... then is abducted by aliens.

Kali escapes captivity to discover earth under attack, and the only thing standing between life and death is Blue, a boy alien to her in every way conceivable.