Kizuna: Much Ado About Nothing (2001)

Sinopsis

In this third part of the series Enjouji and Ranmaru are a mostly-happy couple, but when Ranmaru finds lipstick on Enjouji, he becomes suspicious and leaves in a huff. Enjouji follows Ranmaru throughout the day. As they do so, the two men think about their past and their uncertain future.