From Girls' Generation Scanlations:

Nakano, a worker at a giant Toy company, finally got to meet with his old friend from high school, Tasuda, because of a business contract. In truth, before graduating high school, Nakano realized he had feelings for Tasuda while Tasuda was dating another girl. Nakano has been trying to avoid him ever since, but that was 10 years ago. Will they be able to work together...?

From Sublime:

Volume 1:

Although they were best friends in high school, Nakano and Tsuda haven’t talked in ten years. Which may have a little something to do with the fact that not only were they more than best friends, but also that Tsuda broke Nakano’s heart, leaving him to pick up the pieces. Now that they’ve been thrown back together thanks to a work project, Nakano is determined to put the past behind him, and both men decide to keep their relationship strictly professional. The question is, can they?

Volume 2:

Tsuda likes Nakano and Nakano likes Tsuda, but somehow they keep missing each other at the pass. Amused by the awkward relationship between the two, Tsuda’s coworker Saeki takes off with Nakano, leaving Tsuda to tear through the whole town in a panic to find them. But what happens when he finally does? Includes the end of Tsuda and Nakano’s story as well as a short story about a fateful meeting for Saeki, the “eternal teenager.” Final volume!