History VideoGame / SigmaHarmonics

Released in 2008, ''Sigma Harmonics'' is a Creator/SquareEnix RPG for the UsefulNotes/NintendoDS, developed by the team that had previously worked on ''VideoGame/DirgeOfCerberus''. It is set in an alternate Tokyo, and focuses on the story of Sigma Kurogami, the future head of the Kurogami clan, a line of 'sound-users' who can create miracles and guard the Great Clock that seals the demonic Ouma. The story begins when someone changes the past, destroying the present day and releasing the Ouma.

** In the [[spoiler: original]] timeline, [[spoiler: Yuu]] was killed in a car accident. [[spoiler: Sigma]] comes from a timeline where that accident didn't occur.
** Sigma also encounters a timeline where [[spoiler: Neon]] was the one who perished instead.

** [[spoiler: Neon]] sacrifices herself so that Sigma can travel in time.
** In another timeline, [[spoiler: Neon]] died to save [[spoiler: Yuu]] from an otherwise fatal car accident.
* HumongousMecha: [[spoiler: Used in the final battle.]]
* IdenticalGrandson: [[spoiler: Mimiko]] looks exactly like her grandmother [[spoiler: Neon]].
* ImpaledWithExtremePrejudice: [[spoiler: Neon]], at the end of the trailer.

* TheNotLoveInterest: Neon is set up as Sigma's apparent ChildhoodSweetheart, they have some very flirty dialogue throughout the chapters, and after she [[spoiler: sacrifices herself as part of the price one has to pay for time travel]] Sigma decides to ScrewDestiny so they can be together again... but it's heavily implied that [[spoiler: they're blood siblings]], Neon's difference in last name is due to her being adopted by the Tsukiyumi clan.
* OneWingedAngel: [[spoiler: Rin]] in the final boss battle, this is a Creator/SquareEnix game so it shouldn't really come as a surprise.

* StrongFamilyResemblance: [[spoiler: Yuu]] grows up to look identical to his father, except for hair color and the scar on his father's face.
* {{Synchronisation}}: [[spoiler: Obaba]] turns out to be a pair of twins named [[spoiler: Plum and Take]] who are so in tune with each other's sensations that only one of them can be awake at any given time. [[spoiler: Fuyou]] uses this psychic connection to murder both of them in a way that gives [[spoiler: her]] a convenient alibi.

* TimePolice: PlayedWith. Sigma is indeed one, but [[spoiler: the timeline he thinks he is restoring is the artificial future brought about by time travel]]. [[spoiler: Rin]] is the Time Cop charged with returning things to the way they ''actually'' were.
* TimeTravel: The plot of the game hinges on [[spoiler: the conflict between at least two time travelers]] and their efforts to change the past.
* TimeyWimeyBall: Time travel was originally presented as having a single timeline, with changes in the past affecting changes in the present. Then, TheReveal shows that [[spoiler: multiple timelines are in play]] and the finale throws out pretty much every rule presented so far so that [[spoiler: Sigma]] can essentially become a RealityWarper so that his timeline can exist instead of being erased.

* EverybodyDidIt: Also PlayedWith. Every adult introduced in the various chapters end up being the culprit in each of the murders.

This game has an [[SugarWiki/AwesomeMusic excellent soundtrack]], composed by Creator/MasashiHamauzu, and beautiful anime-style artwork. Sadly however, it has not yet been released outside of Japan.

* NiceHat: Neon.

* TheNotLoveInterest: Neon is set up as Sigma's apparent ChildhoodSweetheart, they have some very flirty dialogue throughout the chapters, and after she [[spoiler: sacrifices herself as part of the price one has to pay for time travel]] Sigma decides to ScrewDestiny so they can be together again...but it's heavily implied that [[spoiler: they're blood siblings]], Neon's difference in last name due to her being adopted by the Tsukiyumi clan.