SINce Memories: Hoshi no Sora no Shita de

The story follows Mizumoto Jun'ya, a college student who works at his family’s general store Mizumoto-dou. The only thing in Jun'ya’s mind is the death of his older brother Takaya who passed away the year prior. He asks himself every day why he was the one that got to live while his brother passed away.
One day, Jun'ya meets a girl who tells him, “You should’ve been the one to die,” before vanishing.

Jun'ya ends up taking on the task of renovating a traditional Japanese manor belonging to the family of Houjou Chihaya, your typical flawless ojou-sama and who happens to be his childhood friend. Since he has no idea how to even start, he’ll need to get help from various people, and he’ll need to get out of his funk to do so. Jun'ya will also have to learn how to deal with all of the emotions and problems along the way. Will he succeed in renovating the old Houjou residence? And who was that girl who told him that he should’ve been the one to die? The fate surrounding the death of his brother will soon begin.