Boku no Naka ni Kimi ga Inai

Subaru, a college student, loses part of his memory in an accident—a memory of living together with his high school classmate, Souji. After getting discharged from the hospital, Subaru starts living together with Souji and comes to know him once again. He is a surprisingly caring and anxious man, but Subaru notices Souji looking at him with a kind gaze he had never seen before... (Source: Frontier Works, translated)