Yes, you read the title right. A fan has actually created an otome game based off the Swimming Anime PV by Kyoto Animation! I highly recommend giving it a try, since the game is really amusing. It is still a work in progress though, and the creator will be updating the DeviantArt page as more content is added.
For the uninitiated, you can watch the original swimming anime PV below:
Additional note: “Animation Do” is a sub-studio of Kyoto Animation.