In this world, a very small number of people will awaken as "rebirthers" after experiencing their first "death".
They have an immortal body and can recover from any damage in a short time. When they first awaken, they will summon a semi-corporeal energy life form called "Shadow".
Shadows have different shapes and abilities.
Society has a complex attitude toward reborn people, ranging from use to fear and rejection.
The story will revolve around how a group of regenerates with different personalities find themselves in this world, fight against fate, protect what they cherish, and play a hilarious and passionate immortal concerto.
