Hinoke no Kyoudai Kageke no Shimai

Meet the Hino brothers. The eldest brother, Juuzou, is womanising author, the middle brother, Jirou, is an elite salaryman, and the youngest brother, Itsuki, is a normal high school student. Juuzou has no interest in getting married, but Jirou does – and ends getting engaged. And who is his fiancee, but Juuzou's ex-girlfriend! From Maga Reborn