"Someone Else's Man", the English title for Hito no Mono (人の夫) is a song from Persona 4. The song is composed by Atsushi Kitajoh who also wrote the song's lyric and sang by Tamari. It is the twenty-first track in Disc 1 of the original soundtrack.
It is an enka song popularized by Misuzu Hiiragi, and can be heard in various parts in the game such as the summer culture festival at the Tatsuhime Shrine and the Beef Bowl Shop when the crew travels to Tatsumi Port Island for the study trip at Gekkoukan High School. An instrumental version is played in Persona 4 Golden at the Shiroku Pub. The song is also a DLC background music for Persona 4 Arena Ultimax.
Persona 5 The Animation
Anta ni deatta ano sakamichi arukeba
Whenever I walk along that hill road where I met you
- The lyrics foreshadow Namatame's affair with Mayumi Yamano, which kickstarted the Midnight Channel incident of Persona 4.