Heart

== Trivia ==
* Heart debuted in O.N.G.E.K.I. PLUS.
* The song's title is a direct translation of its Japanese title 心 ("kokoro").
* At the end of the song, a series of small trace notes come together to make the Japanese title 心, like in the MASTER chart in O.N.G.E.K.I. (where the title is formed with bullets).
* This is the first song to have a Past difficulty of 1 since dropdead, which was released in version 1.7.2 four years prior.
* The charter, écologie, is a core charter for SEGA's CHUNITHM, and has also charted for O.N.G.E.K.I.
== References ==