The boyfriend of a girl died in a car accident, but then his twin brother returnes home and pretends to be his dead brother. Then the girl and the twin brother have sex and in the end the twin brother also disappears. Some years later he comes back and believes he is his dead brother.
Do you know the name of this manga?

I think you're looking for this manga: Bokura no Koi wa Shi ni Itaru Yamai no You de

Quote from RockDoll

I think you're looking for this manga: Bokura no Koi wa Shi ni Itaru Yamai no You de

Thank you, that's the name ^^