[*Doki Doki Compatibility Quest: 3*](<https://minecraft.wiki/w/Doki_Doki_Compatibility_Quest:_3>) was a visual novel released by Mojang to promote the launch of MCPE 0.12.1. It was published on Mojang.com, and thankfully archived by Wayback. [The Wayback capture](<https://web.archive.org/web/20151015185911/https://mojang.com/2015/09/windows-10-and-pe-gets-cross-play-the-nether-more/>) even almost works, but there's no music on Firefox and Chromium, due to not all audio formats being archived.
This post contains both a download of the game files in original form (`dokidoki.zip`), and a modded version to make it work independent of the original site (`dokidoki_mod.zip`). The modded version should work even by simply opening `index.html` in a browser.
The modded version is hosted here, so you don't need to download it: https://grzesiek11.stary.pc.pl/dokidoki/ (the last slash is important due to browser quirks).