Nete mo Samete mo Omae ni Muchuu

Five years of snipes and passive-aggressive jabs have turned System Engineer Ryouhei Munataka and Salesman Kanae Honjou's workspace into a full-blown battlefield. But when a major project forces them to collaborate, the constant tension takes an unexpected turn. Ryouhei, thrown for a loop by a vivid dream where Kanae kisses him with surprising passion, starts to see his coworker in a whole new light. Blurring the line between reality and fantasy, Ryouhei mistakes Kanae for his dream counterpart and makes a shocking move that puts them both in a compromising situation!

(Source: Tokyo Mangasha, translated)

Note: Includes one extra chapter.