This is wakocha (Japanese black) made by Mr Kimura, Sashima, Ibaragi prefecture. His black tea is made from Chin-Shin oolong cultivar, which is very popular in Taiwan, but very rare in Japan.
Like this, many wakocha are produced at single estate and from single cultivar. As of 2019, there are about 120 kinds of registered cultivar in Japan. Even the same cultivar, the taste are different from region to region, from tea maker to tea maker, and even from year to year like wine, which I think it's fun.
The reddish orange cup is refreshing with a flowery aroma and a bit of spiciness. Together with Swiss roll.