NOTE!!!
Due to an issue in the at-the-time latest version of Epub Metadata editor I use, the files can’t be opened in Calibre (works everywhere else as far as i can tell).
Here is a fixed version >>> Volume 1 / Volume 2 / Volume 3 (MEGA)
If this novel ever gets out of hiatus and gets more translation, I will upload a new torrent with the fixed files.

To fix this locally (or if MEGA dies), you have to:
open the files in an epub editor (Sigil is best, Calibre’s editor works too),
find and open content.opf,
in line 2 (the <package line) change xmlns:opf= to xmlns= (basically delete :opf from there).

Title: Tenkuu no Shiro wo Morattanode Isekai de Tanoshiku Asobitai / I Want To Play Happily In Another World Because I Got A Heavenly Castle

Author: Mitsuru Inoue

Illustrator: Hirai Yuzuki

Genres: Adventure, Slice of Life, Fantasy

Translation: LightNovelsTranslations

An angel made a mistake, resulting in Shiihara Daiki’s death. In order to hide the mistake, he was then sent to a different world. The angel will grant him one wish as a payment for keeping it a secret. Daiki asked for a Heavenly Castle floating in the sky without hesitation.
Suddenly a floating castle appeared in the new world, which causes confusion amongst the people. They attempt to contact Daiki in various ways. A country tries to steal it by force, while another seeks to befriend him. What in the world would Daiki do?

Web novel chapters 1-124 divided as the LN volumes. Illustrations added (there’s no greyscale ones for vol 3 I didn’t find them).
The novel seems more or less on indefinite hiatus, only 3 more chapters in the past ~1.5 years.