It’s a questline with several important choices, which can lead you totwo different endingsto The Tea Ceremony.
If you do everything correctly, then the assassination is carried out during a simple cutscene.
Dress For Success: Red or Black Kosode?

Before the Tea Ceremony begins, you should probably complete the miniquest: “Dress For Success”.
If you choose red, then Wakasa will gently suggest that you should put more effort into your kosode.
If you choose black, then she’ll compliment you on your choice.

Regardless of your choice, you might carry out the rest of the quest without any meaningful consequences.
The Perfect Gift: Teapot, Jar, or Ladle?
Feel free to answer how you like with the other two.

You’re free to pick any of the three names: Shizuka, Sanuki, or Shigure.
You may have heard of me?".
The correct choice is to respond with “I’m new to Sakai”.

If you do this, Wakasa will repond positively to your truthfulness.
The correct answer here is “I didn’t say where I was from”.
Wakasa will appreciate your answer, which is a great deal better than the alternative.

Should you bow head, halfway, or deeply?
After speaking with the three women, the Tea Ceremony itself will begin.
Your first test is how to bow to the host, Master Imai Sokyu.

Which way should you turn the bowl?
It’s very confusingly phrased though; the options ought to have been whether to turn the bowlclockwiseorcounter-clockwise.
Should you confront Otama or Wakasa?

The correct answer is to confront Wakasa.
This is the part that’s most likely to misdirect you towards incorrectly confronting Otama instead of Wakasa.
If you choose incorrectly andconfront Otama, then Naoe will follow Otama as she leaves.

You must then chase down Otama and assassinate her.
You’re then left with no choice but to track down Wakasa inside Osaka Castle.
You’re then free to move around her home while Wakasa continues to talk about her past.

Interact with it to trigger a cutscene where Naoe picks up the Teppo and drops the act at last.
Naoe, wisely, refuses on your behalf and shoots her.
She then tries to bargain with Naoe one more time, but Naoe refuses and shoots her.
Either way, you’ll be forced to journey to Osaka Castle to get to assassinate Wakasa.