Mofuku mibôjin: Shijûku-nichi no jôji

Summary

Two weeks ago, Yukino's husband suddenly passed away while on a business trip, leaving her a widow. While sorting through his belongings, she found a promissory note from several decades ago. Following the address written on it, Yukino arrived at a guesthouse. It turned out to be a guesthouse run single-handedly by her husband's former classmate, Miwa.