Ai wa Doko Itta?

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… (Source: Fantasyshrine)

Also contains the one-shot:
March Revolution
One day Daisuke kissed his childhood friend Sachi in the school infirmary, thinking that Sachi was passed out, but he was mistaken. Sachi pretends he doesn't know, but as their high school graduation approaches, he discovers his friend intends to go to Tokyo to go to college. Faced with this deadline, he decides to confront his friend about his feelings.