Twist of Fate (feat. Ruriling)

It helps to memorize the rhythm in advance and focus on reading the hold positions and note order. If your judgment slips during the trills, it can drag down the rest of the run and the big stairs, so pay close attention to your judgment.

Just memorize the slow section entirely, then use the notes that appear during play as hints. The note layout itself is easier than the 17 of the same song, but it got a 21 because of the extreme slow, so if you're good at reading slow or have it all memorized, there's no 21 easier to full combo than this.

this is essentially a harder 17, but you will NOT have this in the bag (reven-G 0.25x flat) on a sightread

Is it better to watch a YouTube video first...?

The key is the reading ability for the forced 1 x speed section starting from the chorus. If you can see the path, it's an easy clear; if not, I recommend checking out a low-speed full-clear guide on YouTube. The final 4-tick section follows a drill=bracket=stair pattern, so it's very simple to memorize, but it's surprisingly easy to miss. Since it's BPM 141, you need to step calmly. There's almost no stamina drain, so it's a chart I personally love using to build my UCS gauge.