The Guide Of Love summary:

[From Manga-Updates]1) Takaoka has always been smooth with the ladies, but has yet to find someone he truly cares for. While sent to a marriage counselor by his mother, he comes upon Yoshizawa, who works as a matchmaker. A cute twist of fate brings the two lovelorn men together.2) An extra story about marriage counselor, Yoshizawa, and the shy professor, Takaoka. One too many days dealing with bad relationships makes Yoshizawa question the strength of his love for his man.