'Four-leaf Clover') is a Japanese visual novel developed by Haikuo Soft [ja], and was originally released in Japan as an erotic game on January 27, 2006, for Microsoft Windows.

Yotsunoha has since then spawned two spin-off titles, Osananajimi to no Kurashi Kata and Nono to Kuraso, and has made several transitions to other media.

A manga adaptation illustrated by Japanese artist Bow Ditama was first serialized in the Megami Magazine on January 30, 2008.

One of the player's objective in the original version of the game is to view the hentai scenes depicting the main character Makoto having sexual intercourse with one of the heroines.

The story of Yotsunoha revolves around a group of friends, reunited after being separated for three years as a result of the closure of Mochizuki Academy, the school they have attended in together.

Upon arrival, Makoto Yūki, the protagonist discovers that the time capsule the group of friends buried prior to their separation has been dug up.

After being reunited, Makoto and his group of friends decide to stay overnight, looking for clues left behind by their teacher, and find the time capsule.

Hal Film Maker, the studio that has previously adapted Yotsunoha into OVA, was also hired for the computer graphics used in the game.

This version of the game contained new computer graphic scenes and additional voice acting for side characters, which was later available to the limited edition through a patch.

[15] Yotsunoha was also adapted into a manga series, illustrated by Japanese artist Bow Ditama, known for his previous work on Mahoromatic.

[16] Yotsunoha was first announced to be adapted into a two-episode OVA series on July 3, 2007, at the Rondo Robe convention hosted in Tokyo.

[19] Yotsunoha's soundtrack was composed solely by Ryō Kyōna, who has previously also worked on Suku Mizu Porisu, the first commercial project of Haikuo Soft.

While the ending theme "Love Rice" (ラブ☆ライス, Rabu Raisu) was sung by Chata, with composition by Pējun and lyrics written by Yuka Matsumoto.