''To Heart'' is a Japanese [[{{Eroge}} adult visual novel]] developed by [[Creator/{{Aquaplus}} Leaf]] and released for the PC in 1997. It was later ported to the [=PlayStation=] and given voice acting. A second PC version, ''To Heart PSE'' was released to the PC and [=PlayStation=] with the adult scenes removed.

It was followed by a sequel, ''VisualNovel/ToHeart2'', and two anime series.

The gameplay in ''To Heart'' requires little player interaction, following predetermined scenarios with courses of interaction, focusing on the appeal of the eight female main characters. Every so often the player will come to a "decision point", and the story progresses according to the player's decisions. There are eight main plotlines, one for each of the main heroines. In order to see all the possible storylines, the player must replay the game multiple times, making different selections at the decision points.

The characters from ''To Heart'' appear as playable characters in ''VideoGame/TheQueenOfHeart'', a series of doujin [[FightingGame fighting games]] by Watanabe Seisakujo (Known nowadays as Frech Bread).

Creator/{{Aquaplus}} and Examu worked jointly to produce ''VideoGame/{{Aquapazza}}'', a crossover FightingGame featuring characters from several Aquaplus works, released in June 2011. Multi, the local RobotGirl, was chosen to represent ''To Heart'' as a playable character, while Serika, the CuteWitch, can be selected as a [[AssistCharacter support]].

!! This game contains examples of:

* AllJustADream: The first omake, where Hiroyuki wakes up in a world where his friends have swapped roles: Shiho and Akari, Lemmy and Kotone, Hoshina and Aoi, Multi and Serika.
* {{Angst}}: Akari falls into this in ''Remember my Memories''.
* TheAnimeOfTheGame [[note]]context?[[/note]]
* ArtShift: The original 1999 TV series and ''Remember my Memories'' (2004) feature drastically different character designs, color schemes, and general "looks." While this led to cries of TheyChangedItNowItSucks, [=RMM's=] style is [[MisBlamed actually]] closer to the original game artwork.
* BalloonBelly: Shiho in episode 9 of ''Remember my Memories''.
* BleachedUnderpants: ''To Heart'' was among the very first TV adaptations of an {{Eroge}} to achieve widespread success.
* ButNotTooForeign: Lemmy is half Japanese and half American. She has blond hair and blue eyes, and is a HugeSchoolgirl who occasionally uses GratuitousEnglish.
* ClassRepresentative: Tomoko Hoshina.
* ContinuityCameo: Several. See trope page for details.
* ContinuityNod: As mentioned on the ''To Heart 2'' page, the CD that Sango Himeyuri gave to Nagase is [[spoiler:HMX-17 Ilfa's operating system]].
* CuteBruiser: Aoi Matsubara.
* DarkIsNotEvil: Serika Kurusugawa, the local CuteWitch, may be an occultist, but in no way is she evil.
* DatingSim: One of the first ones.
* DeadpanSnarker: Hiroyuki Fujita.
* DullEyesOfUnhappiness: Serio has no light in her eyes, unlike her emotional sisters.
* FlungClothing: In the fifth omake of ''To Heart: Remember My Memories'', Akari Kamigishi takes off her bear costume in front of a stunned Multi.
* ForeignLanguageTitle
* HeroesWantRedHeads: Akari
* HostileShowTakeover: Multi in the sequel.
* HotSpringsEpisode: Episode 9 of ''Remember my Memories'', but done more for drama rather than FanService (we do see a nude Akari) [[spoiler: the whole scene is spent with her and Hiroyuki in a heart-to-heart talk, which in the end doesn't resolve their relationship problems.]]
* HugeSchoolgirl: Lemmy.
* JerkWithAHeartOfGold: Hiroyuki, though he's more aloof than he is a jerk.
* KansaiRegionalAccent: Played straight with Tomoko Hoshina, who grew up in Kobe. This is a minor plot point in ''To Heart: Remember My Memories''. She's also appropriately voiced by Creator/AyaHisakawa.
* LastEpisodeNewCharacter: Konomi Yuzuhara from ''To Heart 2'' appears in the sixth {{omake}} of ''To Heart: Remember My Memories'', which doubles as an EarlyBirdCameo.
** The Himeyuri twins from ''VisualNovel/ToHeart2'' appear in the final episode (though they also make an appearance in an earlier episode), and a ContinuityNod follows (as stated above).
* LettingHerHairDown: Tomoko Hoshina in ''Remember my Memories'', who also [[TheGlassesGottaGo appears without her glasses]], which makes her unrecognizable to Hiroyuki and company so she has to wear her glasses again and hold her hair up to jog their memory.
* LikeBrotherAndSister: Used in the original game, with the OfficialCouple. When Hiroyuki finally gets Akari into his bed, he is mortified to discover he can't get it up, as he thinks of her more as a little sister than actual mating material (a "decision point" appears here, giving the player the option to get over it).
* LoveTriangle: Hiroyuki, Akari, and Shiho in the first season.
** It expands into a LoveDodecahedron in ''Remember my Memories'' with Kotone and Lemmy confessing to Hiroyuki, while Multi inadvertently keeps Hiroyuki's attention enough to make Akari jealous, and then there's Masashi confessing to Akari.
* {{Meganekko}}: Tomoko Hoshina
* MyKungFuIsStrongerThanYours: The rift that developed between Aoi Matsubara and Sakashita-senpai in ''To Heart'' was the result of the latter's unacceptance of "Extreme Fighting" as a martial art. Said rift disappeared in ''Remember My Memories'' when Aoi defeated her senior Ayaka Kurusugawa who had defeated Sakashita earlier on in the tourney with ''one roundhouse kick to the head''.
* NamesTheSame: With "Lemmy" being a rather unusual name, one can't help but be reminded of one of [[VideoGame/SuperMarioBros3 Bowser's kids.]]
** One might wonder how Music/{{Motorhead}} fans would react to this as well, given the name of the [[FaceOfTheBand lead vocalist]].
* NotAMorningPerson: Hiryouki needs to be waken up every morning by Akari, otherwise he comes running late for school. He's still that way even after the end of ''Remember my Memories'': [[spoiler: Akari "tries something" to wake him up for Multi's "reactivation", and [[NoodleIncident Hiroyuki reacts in a way such that later Akari is seen covering her eye and saying "it hurts"]]]].
* OfficialCouple: Hiroyuki and Akari, as mentioned above.
* {{Omake}}: Six stand-alone omakes were made for the first ''To Heart'' anime series, and later seven more for ''Remember my Memories.''
* OneHeadTaller: Lemmy Miyauchi is the only one who is taller than Hiroyuki, [[HugeSchoolgirl for obvious reasons]].
* OrdinaryHighSchoolStudent: Hiroyuki.
* PantyFighter: The seven omakes for ''Remember My Memories''.
* PaperFanOfDoom: Tomoko Hoshina's favored weapon.
* PatientChildhoodLoveInterest: Akari
* PsychicPowers: Kotone Himekawa (see Woobie entry, below).
** In the original ''To Heart'' anime, Kotone's powers merely involved premonition, however, in ''Remember my Memories'', her powers became telekinesis instead.
*** Her telekinesis powers were revealed in the omake to the original series, so she could arguably have both.
* RidiculouslyHumanRobots: Multi, who single-handedly popularized the "mechanical ears" look for anime gynoids.
* RobotGirl: Multi, the earliest example in a DatingSim context.
* RobotMaid: Several, including Multi and Serio.
* SnowMeansLove: The finale of the first season.
* SpellMyNameWithAnS: The fansubs for ''To Heart'' spelled it as Remmy, but then the fansubs for ''Remember my Memories'' spelled it as Lemmy, which was the spelling official dub and sub translations used for the original ''To Heart'' anime.
* {{Spinoff}}: ''To Heart 2''.
* SpotlightStealingSquad: Multi in the sequel.
** Multi also proved exceptionally popular in fandom after the first ''To Heart'' anime aired, which is likely why she got so much focus in RMM.
* StaticCharacter: Hiroyuki still needs to be woken up by Akari in the morning even in the epilogue of ''Remember my Memories'' (and they're already University Students by then for crying out loud!).
* {{Tsundere}}: Shiho Nagaoka is a Type A.
* TwelveEpisodeAnime: Two of them, anyway. Separated by a 1-year TimeSkip in-story, and a 5-year gap in production dates.
* UnluckyChildhoodFriend: [[spoiler: Lemmy, as revealed in ''Remember my Memories'', was actually a childhood friend of Hiroyuki (complete with a picture of her and Hiroyuki, with her hair dyed black), but moved to America all of a sudden before the first series before coming back; she was in love with him this whole time, and she not only confessed to him in RMM, but tried to get him to elope with her when it turns out she's moving back to America soon. He turned her down though.]]
* VictoriousChildhoodFriend: While there are multiple route due to the nature of the game, Akari is more or less the main heroine.
* VillainForgotToLevelGrind: Ayaka Kurusugawa. See MyKungFuIsStrongerThanYours, above.