Premieres April, 2025. The new PV is here. Check out the Crunchyroll article for additional information. Synopsis from AniList:
Welcome to Kowloon Walled City: a dystopian townscape where the people are brimming with nostalgia, and where the past, present, and future converge. Amid the hidden emotions and extraordinary daily lives of the men and women working in its confines, a tale of romance begins to unfold for real estate agent Reiko Kujirai—one that feels as familiar as Kowloon itself…
Quite fitting for something that probably plays in the late '80ies - early '90ies.
(I don’t know anything about that manga/anime, I just know that the real Kowloon Walled City was torn down in '93-'94)