Musuko No Yome
Summary
A new 'Old man Meets Girl' manga from the author of 'Yandere Kanojo'. Muramasa Yukari is a man in his forties, who works as a teacher in all-girls high school. One day he got a call from unknown girl, who told him his son passed away and that she was his widow. That was the beginning of his life with his newfound daughter-in-law.