Changed to Kirikiri game engine. Initially announced to be free until the release of [url=/v22603]Mirai Radio to Jinkou-bato[/url] in 2018, but is still available for free as of the last time this entry was edited, several years later.
As for September 2021, only DMM version remains available - the Laplacian Booth link is dead [url=https://www.mediafire.com/file/ubone77ywwvb5gg/kimi-yume_%25E7%25A7%25BB%25E6%25A4%258D%25E7%2589%2588.7z/file](backup).[/url]