The "Old World" was once an advanced civilization that utilized ether from the Planet Tree, Esthanatelle, but it eventually destroyed itself with nothing but "Attribute" relics remaining. Afterwards, the Esthanatelle Order, a religion centered around the Planet Tree, became the main political power of the world and established the Halbern Machinery Academy to research Attributes. The main character, Cram Lanvelouche, is an ace student of the academy who is tasked with investigating Ruin #7. Near the end of the dungeon, he meets a trespasser, Retla, who teams up with him in later dungeons. The two eventually discover Estiole, a mysterious girl who was sealed in the Planet Tree itself. Unfortunately, the trio ends up getting involved in the secrets of the Old World, which threaten the safety of the current one.
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- A.I. Is a Crapshoot: The Noah computer system was meant to govern humanity, but Apocalypse Noah, the 13th node of the system, turned against humanity and the other nodes.
- Advanced Ancient Humans: The "Old World" has much greater Ether technology than the current civilization. According to Gertheim, they're also Abusive Precursors who were unknowingly ruining the planet's Ether balance, which is why Apocalypse Noah went berserk in the first place.
- Anti-Frustration Features: The option to flee from battle also shows the success rate of fleeing, which can potentially keep the player from wasting a turn trying and failing to run.
- Bittersweet Ending: Gertheim and Apocalypse are defeated, but the Etherlight Network being unsealed means Ether technology will flourish and potentially cause another Ether imbalance for the planet.
- Boss Rush: The final dungeon requires the party to defeat recolored versions of past bosses to proceed further.
- Combos: The battle system utilizes a combo system where "arts" can be chained. Using non-repeated arts will increase the damage multiplier while repeating arts will lower the multiplier and not refill the combo time limit. The "Over-Art" version of an Art is considered a different skill in the combo.
- Developer's Room: After beating the game, the player will be sent to the sound test room, which also contains the developer's Author Avatar, who explains plans for a sequel.
- Permanently Missable Content: The Heads I Win, Tails You Lose version of Gertheim will drop Unlimiter II if the player wins and is the only opportunity to obtain this accessory.
- Sequel Hook: In the ending, Cram mentions that he wants to look for the Skynaut, an airship, hinting at the sequel, Flying Dreamer. The Author Avatar in the sound room also mentions plans to make the sequel.
- Super Mode: Overtension will increase a character's cost gauge to allow them to perform longer combos, but they'll be left with 0 TP and will be tired afterwards.
- Rocket-Tag Gameplay: This applies to bosses, who can easily wipe out the party if they get lucky, but will fall quickly if the party uses Overtension and hits their weaknesses with a long combo. Due to how many bosses have regeneration, the game favors offensive tactics over defense in general.
- World Tree: The Planet Tree, Esthanatelle Noah, is actually a colossal Attribute that seals Apocalypse Noah.