You’re All Dead If You Mess With My Brother

I became the sixteen-year-old Rosalitte.
Upon rolling off my bed, I opened my eyes to the world of ‘Asterion of the Blue Starry Night,’ a cliche BL novel packed with drama, blind passion, and angst. I found myself as none other than Rosalitte—the sixteen-year-old elder sister of the main character Asterion, who committed suicide after leading an impulsive life.
Although I let the original story unfold as planned, at its finish, I found myself back in the body of sixteen-year-old Rosalitte. This time instead of sitting idly by, I tried to raise Asterion well, yet ended up dying for a second time and woke up back in repossession of Rosalitte. I tried deviating from the novel and engrossed myself with disciplining myself instead of my younger brother—but failed to escape the loop. It was the same ending when I began to learn magic, and even again when attending the magic tower’s graduation party.
After reincarnating as Rosalitte Roxburgh for the sixteenth time, I’m still looking for a way to die and end this never ending cycle.