A = Uchuu Shoujo 2 x Tamashi no Sokudo

is a Japanese light novel series written by Hino Hifumi, with illustrations by Amajio Komeko. The series began publication on January 10, 2010 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Takafumi Toya, a high school student with an out-of-body constitution, was swimming toward the moon. There, Takafumi meets a mysterious beautiful girl. A few days later, a transfer student appeared to know the secret of the moon girl ...