What's that bl manga where uke has a mentality of a kid and seme was taking care of him. T...

What's that bl manga where uke has a mentality of a kid and seme was taking care of him. They live on a island and they were very peaceful. Turns out, uke's mentality was PTSD of the day both couple accidentally killing uke's homophobic father. So they were on a run for it. It was raining a that time and stormy so the father accidentally fell on the river. At the very end, the uke finally came out of it and had Double personality disorder. So uke's real personality resurfaced