The 4th Volume of Zero's Tea Time was published in Japan on November 18, 2019[1]. Originally released for the price of 630 yen, its price was increased to 693 yen in April 2021. The ebook version was released on the same day.
To Detective Conan, Haibara's Lost Phone Strap Case (Manga: 997-999, Anime: 925-926): This chapter happens concurrently to that case of Detective Conan, showing Yuya Kazami's side of the story when Rei Furuya was calling him during it.
Trivia
In Chapter 36, Hanzo's obstacle course resembles a Japanese sports entertainment TV special's four-stage obstacle course, Sasuke or also known as Ninja Warrior.