ウェブSingle-player. Baldr Sky (バルドスカイ, Barudosukai) is a duology of Japanese adult visual novels with 2D action elements developed by Giga. The series characterizes itself as a cyberpunk action adventure game. [1] The first game, named Baldr Sky Dive1 "Lost Memory” was released in Japan on March 27, 2009, for Windows.