I was underwhelmed a bit by Witch Watch so I picked up another new one: The Magical Revolution of the Reincarnated Princess and the Genius Young Lady. It's an isekai.
It is not, however, exactly how it is billed: "Noblewoman Euphyllia loses her title as heir to the throne. Silly Princess Anisphia secretly plots to restore Euphyllia's honor."
Euphyllia is, indeed, a noblewoman who was on track to become the next queen -- by marrying the Prince (who's name starts with A, though I've forgotten what it was, but you can just think of him as "Asshole"). She is the Genius Young Lady of the title. The Prince cancels their betrothal in a very public setting, pushing her aside for another Baron's daughter and claiming that she bullied the other girl (who's name I also have no idea what it is). It's obviously either fabricated or the machinations of someone.
Anisphia or Anis is, also, indeed a princess. She renounced her claim to the throne because she has no magic. She's the isekai'd one and regains her memories at the magical age of 5, when it usually seems to manifest. She is an inventor and is working on "magicology" -- harnessing spirit stones that hold magic to make magical inventions so that potentially anyone could use magic. She's not really silly, though she is highly energetic and unorthodox.
When the Prince rejects Euphie, Anis immediately takes over and whisks her away and asks the King to "give" Euphie to her -- for an assistant. Though she apparently also has a crush. Not sure yet if the Yuri stuff here will be fully developed, but it is strongly suggested.
Interestingly, they are spending a fair bit of time on Euphie's transition from Queen to Be to Anis' assistant. I'm finding it interesting and engaging so far. Kinda glad that Anis isn't just "silly". Will update once I've watched more.