Naruto: Unlocking Kaido Template - Chapter 191

[Starting MAY 19th, I'll upload 3 chapters per day, or at least 2 if I'm busy IRL.][Ding! Resurrection of the Dead can be used on this target.][Ding! Extraction of the Dead can be used on this target.]…When he was surrounded by thousands of his enemies, Kai decided to comply by extracting his 'strongest skill' in order to cause chaos and drag more people to hell with him.However, when Kai extracted his skill, he awakened an unknown power that made him feel that he had complete control over everyone's life and death.A mysterious old man awakened from his slumber when he sensed Kai’s power and decided to help him, as this could be considered a fate.Nevertheless, everything came with a cost…[Ding! Re-Awakening the host’s class.][Ding! An error has been detected.][Ding! Finding a solution…][Ding! Congratulations to the host, you have awakened the Immortality Lord Class (???)]

Childhood sweethearts.
The most popular person in school is my childhood sweetheart.

- Description from Novelupdates

Kain can control luck because of the curse, doomed to run from death - forever.“I lost everything again...?” Kain muttered. The Keepers fell as the monsters burst out of the Rift.Unlike the others, he hated Keepers, the only people capable of fighting the creatures from the Astral Dimension. Everyone saw them as heroes, but Kain blamed them for the greatest tragedy of his life - the death of his parents.Ironically, the sacrifice of one Keeper allowed Kain to obtain a Rune Brand - the key to begin a trial, the outcome was either power or death.Facing another world, Kain discovered that his blood was cursed, and misfortune would always haunt him.But death would avoid Kain, wanting to keep such a valuable sacrifice for a god. Only failure would await him, but if it were possible, death would pass by.Now, Kain must break his curse and take fate into his own hands for the first time in his life or remain a nameless offering.

Karl Adelheit, a self-proclaimed ordinary student returning from military service.

And a nobleman who enlisted as a soldier and received Medals of Honor.