[1][2] The game translates the format of Chunsoft's "sound novel" titles such as Otogirisō and Kamaitachi no Yoru, in which players read text and select choices in order to advance the narrative, into an eroge.

[3] The story focuses on psychological horror, exploring themes of mind control, conspiracy theory, sexual assault and social alienation.

Shizuku was the first game to incorporate "erotic content" into the visual novel genre, using the format used in Otogiriso.

It has also been described as similar to the visual novel Kizuato, also produced by Leaf,[4] with themes of bloodshed, violence, and humiliation, with a "dark narrative".

[5] The game has also been described as a "landmark" for Leaf, in the company's visual novel genre, and mentioned in the anime adaptation of 16bit Sensation.