History VisualNovel / Code18

* AdaptationDecay/ AdaptationDisplacement: [[invoked]] Both are discussed in Nanari's Route, who, when hearing of a movie adaptation of a book she read, mentions how the novel was apparently much darker than the movie. As for the latter trope, Hikari express surprise that there was a novel.

* [[spoiler:BabiesEverAfter: Not seen in-game, but guaranteed for Hayato and Hikari several years down the road, what with Akari's existence being ensured. Indeed, at the end of the credits, we see several shots of Hayato and Hikari's future with Akari.]]

* CosplayOtakuGirl: Tamaki.

* FirstKiss: [[spoiler:Tamaki and Yuzu's Routes end on this.]]

* [[spoiler:[[FutureMeScaresMe Future Me Irritates Me]]]]: [[spoiler:Upon hearing about his future self from Akari, Hayato expresses irritation towards his future self, wondering how he could have turned out that way. It's later subverted, though, when he learns of his future self's true motives.]]
* [[spoiler:GetBackToTheFuture: This is the main goal of Arika's Route: repairing her time machine so she can go back to her time. As it turns out, this is the key to breaking the infinite loop, for with Akari back in her time period, she won't be creating another TemporalParadox.]]
* [[spoiler:GroundhogDayLoop]]

* OfficialCouple: [[spoiler: Hayato/Hikari]]

* StepfordSmiler: [[spoiler:Hikari.]]

* ChekhovsGun : [[spoiler:Ironically, the game's theme song becomes one, see ThemeTuneCameo for more details.]]

* ThemeTuneCameo: In her route, Hikari blatantly hums the game's opening song several times. [[spoiler:Arika hums it once too, as she learned the song from Hikari, her mother.]]
** [[spoiler:This turns out to be a key plot point in the end: in order to activate the time travel function on the Dragon Unit, Akari needs to sing the song (which is the password). Unfortunately, she doesn't remember the full song, but fortunately, Hikari happens to call at that time, and sings the song for Akari, who then remembers the lyrics and sings the rest of it.]]

* [[spoiler:JerkassFacade: Future Hayato deliberately ignored Akari because he needed to finish the time machine in time so that he could send Akari back to the past to ensure her existence. However, he couldn't risk her learning about the plan, so he acted indifferent.]]

* [[spoiler:StableTimeLoop: This turns out the be the whole purpose of the plot: in order to make sure that Akari existed in both 2018 and 2040, Future Hayato put everything he had into building a time machine so that he could send her back in order to maintain her existence. This sends her back to 2018, retaining her existence, where Future Hayato sends messages to Present Hayato in order to guide him. Present Hayato sends Akari back to her time, and armed with the knowledge from his future self, begins the process all over again.]]

* [[spoiler:StrongFamilyResemblance]]: Averted: [[spoiler:the only part of Arika that remotely resembles her parents is her mother's eyes.]]
* [[spoiler:SuddenlyVoiced: Hayato's voice is only heard twice in the game: once on the audio recording he leaves on his smartphone that Hikari plays once, and his future self through the voice messages, though it's not clear its him until near the end of the game.]]

The "official" fifth game in the VisualNovel/{{Infinity}} series. However, unlike any of the previous ''Infinity'' games, this one has no involvement of either Takumi Nakazawa and Kotaro Uchikoshi, the series' main director and writers.

The "official" fourth game in the Infinity series, composed of ''VisualNovel/{{Never7}}'', ''VisualNovel/{{Ever17}}'', and ''VisualNovel/{{Remember11}}''. However, unlike any of the previous Infinity games, this one has no involvement of either Takumi Nakazawa and Kotaro Uchikoshi, the series' main director and writers.

* NamesToKnowInAnime:
** Creator/AiNonaka: Hikari Haruna.
** Creator/KeiShindou: Tamaki Tategawa.
** Creator/MadokaYonezawa: Arika Tokitou [[spoiler:(Akari Hino)]]
** Creator/SanaeKobayashi: Yuzu Soraki.
** Creator/UnshoIshizuka: Genkuro Kanbara[[spoiler:/(Torikura)]]
** Creator/YasunoriMasutani: Yoshito Asakura.
** Creator/YukoGoto: Nanari Torikura.

* ShoutOut: The Sky Tower looks very similar to Integral Tower from [[TwelveRiven 12Riven]].

The "official" fourth game in the Infinity series, composed of {{Never7}}, {{Ever17}}, and {{Remember11}}. However, unlike any of the previous Infinity games, this one has no involvement of either Takumi Nakazawa and Kotaro Uchikoshi, the series' main director and writers.

** KeiShindou: Tamaki Tategawa.
** MadokaYonezawa: Arika Tokitou [[spoiler:(Akari Hino)]]

** YukoGoto: Nanari Torikura.

** SanaeKobayashi: Yuzu Soraki.

** AiNonaka: Hikari Haruna.

** UnshoIshizuka: Genkuro Kanbara[[spoiler:/(Torikura)]]

** YasunoriMasutani: Yoshito Asakura.

* [[spoiler:HotMom: Future Hikari.]]

* XanatosGambit: [[spoiler:The whole plot was set up by Future Hayato (with the help of Future Hikari) in order to create a StableTimeLoop in order to ensure Akari's existence.]]