[DVDISO] Kizuna: Koi no kara Sawagi / 絆 KIZUNA~恋のから騒ぎ~ / Kizuna: Much Ado About Nothing (2001) [R1US]

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.

https://myanimelist.net/anime/734/Kizuna__Koi_no_kara_Sawagi