Multiple world lines, micro-science fiction, short and medium stories completed
The protagonists are Kira, the supernova in One Piece, and the passerby Penguin.
Let me first explain the order of the articles.
The chapters from [beginning] to [end] are three different ending lines.
It's just personal taste, so I mixed them up and wrote them together, but it's still very easy to distinguish, the time and place are all indicated.
[Cause] and [Result] are in the same world, with repeated timelines. [Cause] tells the reason why Kira traveled through time, while [Result] is the final outcome of Kira's final return there.
Intention: