Shi ga Futari wo Wakatsutomo

Overview

If you change, the world can change too. On Christmas night, a clumsy demon named Yotsuba saves Ryusei, a young man on the brink of death. Bound together in a state of “shared life,” where they will die if separated, the two set out to find Yotsuba’s summoner. Through encounters with people burdened by powerful negative wishes, the fragility and strength of the human heart are gradually revealed. As Ryusei confronts his own tragic past, he awakens to a mysterious ability—the power to see the past. A dramatic human love story, dedicated to all who yearn for love, begins! (Source: MANGA MILLION)

Source: AniList