The Assassin's Groundhog Day

Rui Kurose is an assassin who never misses. Calm, efficient, and emotionally detached, he takes contracts, finishes the job, and disappears without leaving a trace. So when he is hired to kill Leonard Hoshino-the careless young heir of one of Garakuta's most powerful families-he expects another routine mission. Instead, he dies. Then he wakes up on the same morning again. Every attempt to complete the assassination ends in failure.
Sometimes Rui is stopped by Saya Akamine, Leonard's terrifyingly skilled bodyguard. Sometimes outside forces interfere. Sometimes the entire situation collapses into chaos before he can even pull the trigger. No matter what he tries, the day always ends with his death and the world resetting around him. But as the loops continue, Rui begins to realize the assassination is only a small piece of something far bigger.
Hidden beneath the power struggles of Garakuta is a conspiracy involving forbidden magic, corporate betrayal, and people willing to destroy an entire city to seize control. Worse still, someone else wants Leonard dead-and they are far more dangerous than Rui ever expected. Forced into an uneasy alliance with the very people he was hired to kill, Rui must protect an heir he can barely tolerate, survive enemies waiting around every corner, and uncover the truth behind the endless cycle trapping him.
Because if he fails, the city falls with him. The Assassin's Groundhog Day is a dark fantasy thriller filled with action, tension, sharp character dynamics, and a protagonist who would rather do anything except become the hero of the story.