Len'en Ten'eisenki ~ Brilliant Pagoda or Haze Castle (連縁天影戦記　～ Brilliant pagoda or haze castle) is a vertical-scrolling danmaku shoot 'em up and the fourth game of the Len'en Project. It was made by Trick Nostalgie's sole member JynX and released for the Windows operating system. Unlike previous games, this one works with a cell-based system, allowing the player to take different paths to face different bosses, both unique to this game and returning characters.

The game was first announced on 31 January 2015. On 4 June 2015, a trial version was released, consisting of 3 stages. After over a year of development, the full version of the game was released on 1 December 2016 as a free download. After another year, an additional major update was released on 17 September 2017.

Len'en Ten'eisenki ~ Brilliant Pagoda or Haze Castle screenshots