Remember11 the age of infinity tells two storylines at once, which as a result intersect in a strange way. In the first, an airliner crashes and as a result of the disaster only four people survive, including the boy Yuni, the mountaineer Seiji, the lawyer Rin and the student Kokoro. Having miraculously escaped death, the heroes find a hut where they hide from the weather. Inside the room, the characters discover a newspaper that says everyone except the boy Yuni will die tragically.

In the second story, Remember11 the age of infinity, the action takes place in a mental hospital, where everything also revolves around four characters. Among them are the guy Satoru, who wants to kill someone after falling from a great height and partial loss of memory, the beautiful girl Hotori, the adult and very friendly woman Kali, and the boy Uni. It is noteworthy that no one understands where the boy came from among them, because no one had seen him before.

Some time after the plane crash, Kokoro and Satoru switch places and are surprised to notice the same boy. The narration is presented exclusively in the form of endless dialogues with many possible answers. Periodically, the gamer is required to make choices with far-reaching consequences that affect the tone of the narrative and, ultimately, the ending of the story. It depends on the player which NPCs will ultimately survive, and which ones will actually end up on the lines in the previously found newspaper.