Description

Bound Spire by Lerd0 is a tower-climbing simulation game that blends vertical progression with bondage-themed gameplay, and it’s climbing toward something far more intense with every floor. Developed by Nerou2 Pixiv and currently sitting at version 0.18.2, this 2DCG title puts you in the shoes of a female protagonist who must ascend a mysterious spire where restraint and reward are woven into the very architecture of the tower.

The climb itself is the heart of the experience. Each ascent is a simulation-driven challenge built around vertical progression, and the BDSM elements are integrated into the design rather than tacked on—they shape how you approach the spire and what awaits you on the way up. With AI CG artwork, big ass and big tits character designs, and futa/trans content rounding out the cast, Bound Spire delivers a mature-themed adventure that keeps the tower-climbing loop front and center.

The game is available for Windows and Android, supports English, Japanese, and Chinese language options, and features censored content in its current build. The release date is October 18, 2026, and the project continues to be updated by Nerou2 Pixiv under its ongoing version number, so there’s always something new taking shape in the spire.

If you’re into tower-climbing scenarios with bondage themes and a female protagonist leading the charge, Bound Spire is ready for you to start the ascent. Download it now and see how high you can climb.