Akira Yoshio's Red Thread Series

Kaoru has a special gift. He can see "the red string of fate" and cut it, too. In fact, that's his line of business. Unfortunately, because of this, he himself has no red string.
Knowing that destiny will never attach him to anyone, he detaches himself from any chance of true love. That's why when his client Hara professes his love for Kaoru, he has no choice but to push him away.
Hara doesn't give up, though, and Kaoru finally gives in to his love. Wanting to trust Hara's love for him, Kaoru decides to be with him... yet he still can't help but worry about the red string of fate on Hara's pinky...