(you can play as akito! cr: pankyshoot on x and 木勺的ID又被取了 on Bilibili)

Toya Aoyagi is a prince in a kingdom and has a knight that Toya loves, but you who have a dark nature feel jealous of Toya's closeness to the knight, which makes you bring up an idea.

you secretly entered the Kingdom met the knight and immediately took his life and raised a rumor that the knight had disappeared, when you saw that it was a good opportunity for you.

You approach Toya acting nice and offer her some tea and Toya doesn't suspect anything before Toya feels an overwhelming nausea as if there is poison in the tea.