My Brother Left Behind Someone We Loved summary:

After his brother Haruki passes away, Kazuki heads to a coastal village to meet Yukito, his brother's omega widow, with the hopes of living with him after their devastating loss. Yukito reluctantly agrees to let Kazuki stay in the shed on the property but insists that he doesn't need any help in his day-to-day life. However, with the side effects from the heat suppressants taking their toll on his health, could living with Kazuki end up being beneficial after all?