Gusu na Onore wo Shinuru ga Ii

Synopsis

Is this really my family⁉ A kind family watches over a man with amnesia. But in the midst of his happy days, the man begins to feel strange. What happened before his amnesia⁉And who he really is...⁉ When he gets closer to the truth, his "ideal family" collapses. (Source: Nihonbungeisha, translated)