This chapter serves as a compendium of knowledge about the world of the novel. The information is gradually revealed within the story and is duplicated here for ease of access. As such, it may contain minor spoilers.
General Information:
The Eternal Cycle is the mysterious force that binds Ren's soul to countless reincarnations. Each time he dies, his soul is reborn in a new world, carrying fragments of memory and emotions from his past lives. This cycle cannot be broken unless the true bond he seeks is fulfilled.
Soul Echoes
Every reincarnation leaves behind a Soul Echo—traces of Ren's past emotions and relationships. When Ren encounters someone connected to his previous lives, their Soul Echo resonates, awakening forgotten feelings and memories.
The Fated Bonds
The girls Ren meets across lifetimes are known as Fated Bonds. Each represents a different aspect of love—innocence, sacrifice, passion, trust, or destiny. Only by reconciling these bonds can Ren hope to find the "Eternal One," the girl who holds the key to ending his reincarnation cycle.
The Astral Nexus
Between lives, Ren's soul drifts through the Astral Nexus, a void filled with fragments of his memories. Here, he sometimes encounters Lyria—the silver-haired girl—who guides him, though her true identity remains a mystery at first. The Nexus acts as both sanctuary and prison, reminding Ren of his unfinished promise.
Soul Trials
Every reincarnation presents a Soul Trial—an obstacle tied to Ren's fate. These trials can be emotional (choosing between two bonds), physical (fighting to protect a loved one), or spiritual (facing his past mistakes). Failing a trial means carrying that regret into the next life.
The Eternal Choice
At the end of every world, Ren is faced with the Eternal Choice: to cling to the bonds of that life or to let go and continue the cycle. His decision shapes the path of his soul, determining whether he grows closer to or further away from the Eternal One.