Punch Up! vol. 6 (yaoi manga)

Back when architect Motoharu Maki was just starting out, he nursed a one-sided crush on another—his former mentor Mibu. His current love, Kouta, is shocked to find out that, unlike Motoharu’s usual type, Mibu is a sophisticated, austere person. And even though Kouta has faith in Motoharu’s fidelity, he can’t help but feel a little shaken. What else doesn’t he know about Motoharu, and should he be worried now that Mibu is back in Motoharu’s life?