To Heart is Leaf's fifth game, and the third and final title in the Leaf Visual Novel Series along with Shizuku and Kizuato. The gameplay in To Heart follows a plot line which offers pre-determined scenarios with courses of interaction, and focuses on the appeal of the eight female main characters.
A sequel of To Heart, To Heart 2, was released on December 28, 2004 directly to the PlayStation 2. A special bundle of To Heart 2 and a PS2 version of To Heart was released on the same day. The original PC release of the visual novel was titled To Heart, however the anime and the PSE versions later changed to ToHeart without any space between the words. The English release of the anime uses the former format.