[Rewrite in the works!] Naoto Shirogane was an ace detective. When she was young, she had a cousin named Makoto Yuki, whom she dubbed as her Nii-san for being close to him. Naoto always received letters from Makoto...but when they stopped coming after a year...she feared for the worst. What happened to Makoto? Where is he? Only time will tell. And perhaps, he returns.