GINMOKUSEI: THE TAILOR SHOP

Ginmokusei: The Tailor Shop summary:

Ubuki inherits Ginmokusei, his grandfather's old tailor shop on the outskirts of Ginza, when his grandfather passes on. But unlike the days with his grandfather at the helm, Ginmokusei is now in a slump despite all of Ubuki’s (unrefined) efforts. As the days pass with no sign of customers coming in, Ubuki grows impatient. Then one day, a man named Theo suddenly walks in declaring, “I’ll turn this store of yours into a first rate one, so bet on me!” Will Ubuki, with Theo’s help, be able to turn things around? This time from Mamita: a mature, adult love story between two men in suits!
An adult suit × suit love story between an arrogant former boss and a tailor with no self-confidence.