Hanami-zake, “sake under the cherry blossoms”, is captured with just two cards: the Curtain (March Bright) and the Sake Cup (September). It is worth 5 points.

March · Cherry Blossom Curtain

September · Sake Cup
It's a two-card yaku, so it can appear very early in a round. It adds to other yaku you hold. The Sake Cup is also part of Tsukimi-zake, so holding the Sake Cup together with both the Curtain and the Moon scores both viewing yaku.
The Sake Cup is one of the most important cards in the game. Whenever you can capture it, consider it, because it's half of two different 5-point yaku. Likewise, if your opponent holds the Curtain or the Moon, taking the Sake Cup away from them is strong defence.
Viewing yaku are always on in ranked and casual play here — there is no option to disable them. Private and vs-computer games use the same core scoring.
Because Hanami-zake needs only two cards, it can finish before either player has built a large pile. That speed is why some house-rule tables weaken viewing yaku — but on Hanafuda Legends they are always active, so both players must watch March and September from the opening deal.
Hanami-zake uses the same Nintendo-style Koi-Koi scoring on Hanafuda Legends whether you play ranked, casual, private rooms, or vs computer. Set yaku replace smaller versions of the same family (you do not score Sankō and Shikō together), while unrelated yaku such as ribbons, animals and chaff still add to your total when you stop.
If you are new to the combination, practise in the tutorial or against the computer first, then take it into online play. How to Play covers the turn structure, matching, and when to call Koi-Koi versus stopping for points.
Tsukimi-zake, Sankō, and Animals (the Sake Cup also counts as an animal card).