Kutabire Salarymen no Ore, 7-nenburi ni Saikai Shita Bishoujo JK to Dousei wo Hajimaru

Yuya Amae, an office worker in his third year of work, is completely exhausted from the daily grind. Until one day, Yuya is reunited with Shiratori Aoi, a girl eight years younger from his old neighborhood. Seeing her for the first time in seven years, she has grown into a beautiful high school girl who is good at housework, too. "Yuya-kun, can I stay with you… with the premise of eventual marriage?" Aoi wants to live together with Yuya, her first love. Yuya is confused by her sudden proposal, but he agrees to the cohabitation arrangement, but only as her guardian for now. However, Aoi's seductive approach will cause his resolve to waver!? (Source: HJ Bunko, translated)