Yuki, a 30-year-old supermarket clerk who lives aimlessly and muddle-headedly every day, was accidentally stabbed by a gangster one day. On the verge of death, when he was conscious, he saw a beautiful angel with a pair of pure white wings falling from the sky. Yuki thought the angel was there to pick him up, but he didn't expect that when he was discharged from the hospital after recovering from his injuries, he opened the door and saw the angel was actually in the house. Although Yuki was overwhelmed by the angel's arrogant attitude, he also felt sympathy for him who had lost his memory and couldn't fly, so he decided to take him in. The sudden cohabitation life made Yuki, who was originally like a walking corpse, gradually begin to develop some emotions. The past that he didn't want to recall was recalled, and the mysterious identity of the angel was also revealed.