Regulus Black was a systematic reincarnation.
During the sorting ceremony, Remy, who was sorted into Slytherin, walked straight to the Gryffindor table.
When Professor McGonagall stopped him, he responded by crying loudly in front of all the teachers and students in the school.
This is the story of how a person who does not understand the world and is not understood by the world uses his power after gaining it.
(This article is also called "My Brother Little Remy")
Concept: The story of a reincarnated person traveling through time and becoming Regulus.