It is indeed mostly green tea, although different kind of green teas: "standard" green teas (from Sencha to Gyokuro), teas made of twigs (Karigane), roasted green teas (Hojichas), green tea with rice (Genmaicha), green tea flavored with yuzu (Yuzu Ryokucha), etc. Sometimes we throw in something completely different, like a Zaracha, a Sobacha, or even a Japanese black tea.

This is the 2023 lineup so far: Sencha (January), Yuzu Ryokucha (February), Karigane (March), Genmaicha (April). But while there definitely is variety, yes, you need to really like green tea to fully enjoy the subscription...