It follows the story of a lost human boy named Nino, who awakens in an unfamiliar forest. Due to his amnesia, he doesn't remember why he came to the forest, or what he is doing in it.
It's up to the readers to lead him on the correct path and make the right decisions to avoid the dangers around him, while uncovering the story behind how he ended up lost in the monster's world.
Currently, the comic has it's own website where users can comment command suggestions, to be used by the author to advance the story after every update. It also has a Discord server where update notifications and update discussion, theorizing, and fanworks are shared and produced.
Oceanfalls contains examples of:
- Amnesiac Hero
- Audience Participation: It uses reader submitted command suggestions to advance the story.
- Blatant Lies: Nino and Aria trying to bluff their way past the town guard.
- Blind Seer: The grave of Maya Elwyn, Aria's late mother, is engraved with "The Blind Seer of the Sacred Cenote".
- Bloody Horror: When Nino first finds Five, she is a bloody mess, described to be scratching her skin as if she's trying to peel it off. Made worse by the fact that she is only a child.
- Chronic Backstabbing Disorder: Kotori remarks that monsters tend to act this way. Corona responds that the Winged are way worse in what they do to eachother.
- Combat, Diplomacy, Stealth: These are the three battle menu options whenever Nino enters a random encounter.
- Domed Hometown: A human warrior ended the war between humans and monsters by creating a barrier that simultaneously divided the worlds of humans and monsters, and also sealed both worlds under a massive dome.
- Déjà Vu: What seems to have happened when Nino used his healing hands on the yellow flowers. But perhaps this is just a mere haze.
- Easy Amnesia: At the very beginning. Nino seems to have forgotten everything just by falling down and hitting his head.
- Go Through Me: Five pulls one of these for Aria, against Kotori.
- Great Offscreen War: There is a mysterious war as part of the setting's backstory, between humans and monsters. Aria's mother died in it. It was ended by the creation of a barrier which divided the human and monster worlds; it is this same barrier that forms a massive dome which traps both worlds inside it. Nino's psychological reaction indicates that he has some dark connection to it.
- Heal the Cutie: Starts with both a literal and an actual one when Nino encounters Five, a mere child. As it turns out, Five was sickly and under the care of a number of friends, but the Evil Prince forces them to abandon her and make her undergo a horrific transformation, a fate common for monsters considered weak. By the time Nino finds her, she's a bloody mess crying and clawing her own skin off. Nino's Healing Hands patch her up and, with love and care from him and Aria, Five recovers and shows her sweet, adorable nature again. That said, it's quite clear that the world isn't quite done bringing misery, and there are a lot of hardships left ahead for her.
- Healing Hands: Nino's ability is this. He uses it to undo Five's Painful Transformation.
- Hello, [Insert Name Here]: Nino gets assaulted by all the wrong names entered by readers before his actual name is revealed.
- Horned Humanoid: Monsters are mostly human in appearance, but have red eyes and one horn on their forehead. Seemingly, they have claws which manifest under strong emotions such as anger and stress.
- Madness Mantra: Kotori repeats "Whatever happens, happens" when things get tense with Suvillan.
- Magic and Powers: In the world of Oceanfalls, everyone possesses an ability tied to their very existence. Nino's, for instance, is Healing Hands.
- Our Monsters Are Different: So far all monsters seen are mostly human in appearance, except with red eyes and a single unicorn-like white horn, and dark claws.
- Player Party: As the comic uses many RPG tropes and mechanics, this is an obvious one. Nino himself, of course, is one, and Aria becomes one later. Later, one of the remaining slots gets filled by Meimona.
- Proud Merchant Race: Nino's interactions with the monsters in Redtulip Town give the impression that all everyone cares about is money.
- Title Drop: Parodied when Nino falls into... not the ocean.
- Invoked by Nino himself later when Kaji interrogates him.
- Verbal Tic: Five speaks slowly and with lots of pausing and hesitation. She also speaks in third person.
- Videogame Caring Potential: Due to the RPG-style nature of the webcomic, Nino choosing to help Five is played as this In-Universe.
- Winged Humanoid: A race known as "the Winged" exists, and is revealed to be able to awaken more than one ability.