The Contract Between a Specter and a Servant, Vol. 1 (light novel) (The Contract Between a Specter and a Servant (light novel), 1)

That was the worst day of Masamichi Adachi's life. He failed the college entrance exam again, was fired from his part-time job, and to top it all off, was fatally injured in a hit-and-run. However, just as he was resigning myself to death, a stunningly beautiful man appeared and said to become his servant. In exchange for his life, Masamichi now works for the mysterious entity that runs an antique store...