Soshite, Dare mo ga Uso wo Tsuku

is a Japanese light novel series written by Nozomi Mizukaga, with illustrations by Tea. The series began publication on March 10, 2011 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
A mysterious boy, Adelbert, and his little partner, Ticca, board the huge luxury airship "Titan".

The ship is full of unique people, including adventure merchants who cross the world, bewitching actresses, beautiful mysterious women and their companion newspaper reporters, and the marquis who boast huge financial resources. Seemed to be enjoying. Adelbert was also excited about the voyage with Lira, the daughter of the Marquis family who met on the ship, but the death threat of "getting a blue diamond" arrived from the phantom thief Senin who made a noise, and the atmosphere of the trip changed completely !? ..