Falling Into Darkness Reincarnation ~I Thought I Was Reincarnated as The Main Character But I Turned Out to Be His Older Twin Brother Who Fell Into Darkness Haha~

I have no time to fall into darkness, though? There is a manga called 【Beast Song】, it is set in a modern time where magic and supernatural powers are commonplace. The world is rampant with monsters called beasts, and the humans lived in this world, where their lives are always on the line. A young man who loved this manga—which was filled with nostalgic and interesting settings, and skills that appealed to heart of the fans—found himself reincarnated as a baby in the very same world. “…Isn’t this the older twin brother?” One day, the young man, Izayoi Jin, realized something. That he had reincarnated into the character from that manga who’s destined to fall into darkness…