[Crossover] Death Is Not the End

Itadori Yuji had an older sister. She was an ordinary person, his last and only family. Then, one day, his beloved sister suddenly died. The members of the Armed Detective Agency handed him her belongings. To find out the truth behind her death, Itadori Yuji opened her diary. [The moment I agreed to that thing's offer and gave up my soul, I had already made peace with it. Death is the end of all things.] [Death is not actually frightening.] [I just can't let go of the few bonds I have left.] Itadori Naha had never regretted it. Whether in her previous life or after being reborn in this one, she had always thought herself lucky. This life was no different: she had a strict but kind grandfather and a sensible, obedient little brother. “Will you make a contract with me and become a magical girl? I can grant any wish you make.” She first met [that creature] when her grandfather was hospitalized. “Naha, will you make a wish this time?” “Yes. I want the power to protect my family.” I will never let Yuji die. Even if the price of this power is death. “Will you regret it, Naha?” “No. I'm his big sister. Isn't protecting my little brother only natural?” ■ The early chapters are a little heartbreaking. Read with care. ■ An experiment with a flashback-style, nonlinear narrative. ■ One-on-one romance. The male lead is Megumi. (The romance is slow-burn. The early chapters focus on the bond between Yuji and the heroine, with her romance with Megumi gradually woven in.) Theme: Keep going, and you will reach the end of hope.