Tsunoda Ryoku manga
From Fantasyshrine: Miyagi is the chief of an old prominent Japanese restaurant. One day, the sister store unexpectedly sent over an apprentice chef named Kasuga for training. After their initial meeting, Kasuga was instantly smitten with Miyagi and sets out to pursue him relentlessly. As Miyagi gets subjected to constant assaults, he finds that his defenses are slowly beginning to crack… Will the headstrong Kasuga finally subdue him—? This is a workplace romance served, Tsunoda style!
Takayama has always admired his colleague, Ishikawa, in the pharmaceutical company. While he has been careful in hiding his homosexual orientation from everyone, fate intervened and Ishikawa discovered his secret. However, Ishikawa completely ignored the whole matter until one day out of sheer frustration of almost losing an account Ishikawa ends up violating Takayama. Understanding Ishikawa’s frustration, Takayama forgives him and so begins their unusual relationship—…