Ore to Kareshi no Koi no Hate

A year has passed since Chikashi and Tomoaki, once a manager and his trainee, became a couple. They've started living together, having overcome Tomoaki's transfer to another department and a near break-up. However, Tomoaki is now being transferred to another office entirely. As they embark on a long-distance relationship, will their feelings for each other remain the same...? "It's because he's so precious to me that I want to respect his life."

(Source: Renta!)