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This article describes the story of Evanescent Existence in detail.
One day, several humans from the Outside World are spirited away to a strange land called Mugenri. Although nobody knows where they are, they all want to get out. One of these humans is an inventor named Tsubakura Enraku. Their best friend, Yabusame Houlen wasn't spirited away like the others, but has the power to cross over dimensions. Now, Yabusame has to cross this strange land in order to find their friend.
Yabusame gets lost in Mugenri. As they decide to reach the "goal" in order to get out, on their way, they meet some of their friends (Kurohebi and Aoji Shitodo) which they battle, and beat in the end. They then find Tsubakura, who is acting strange. After defeating Hooaka Shitodo and Kuroji Shitodo, Yabusame finds a "black sun with a torii floating in it. It's there where the most annoying of annoying people they know is found. It's there where they're encountered by Clause, who believes that getting out first by going through the "Black Star" gives power. Both fight and Yabusame is victorious.
Tsubakura's scenario is chronologically before Yabusame's. They encounter the same people as Yabusame, where everyone notices that they are not acting like usual.
In Yabusame's bad ending, they wake up in their home at the Outside World and decides to try again and save Tsubakura.
In Tsubakura's bad ending, it's shown that somebody has been impersonating Tsubakura all along, and after being defeated by Clause, they regain their real appearance. Realizing that they have been overestimating their opponents, the person disguises themself as Tsubakura again.
In Yabusame's good ending, they don't know what to do and heads for the mysterious sun because they can't think of any better solution.
In Tsubakura's good ending, it's shown that they are actually a priest named Tsurubami Senri who was disguised as Tsubakura. Because they didn't know of their personality towards others, everyone suspected it. Without their disguise, Tsurubami decides to wait for the others so they could reach the "goal".
Yabusame and the real Tsubakura cross into the "goal", which is the Shrine Road, where Tsurubami is waiting for them.
In Tsubakura's scenario, it's revealed that they crossed Mugenri with ease, since Yabusame and Tsurubami defeated everyone. After defeating a stronger Clause, Tsubakura reaches the Senri Shrine, where they meet Tsurubami, who reveals that they had caused this all because they wanted a new protector for Mugenri, but not before testing Tsubakura's powers first. After Tsurubami is defeated, they see that Yabusame is coming into their direction and Tsubakura asks the priest to give them a hard fight.
In Yabusame's scenario, after defeating Clause, they reach the Senri Shrine, where they encounter Tsurubami Senri. Because of their similar appearances, Yabusame mistakes them at first. After introducing themself, Tsurubami has a fight with Yabusame to test their power. After a long and difficult battle, Tsurubami is defeated and proclaims both Tsubakura and Yabusame as the new protectors of Mugenri, they want to tell this to Tsubakura but the young scientist was already gone, but not before leaving Yabusame a mocking note.