So... the one writing all the letters to everyone was her friend that Lucia confided in? It reads ss she was also 'captured' but doesn't want to share.
Uh, if you can basically just brainwash him through memory manipulation, they why deal with MC at all? Just brainwash him into choosing you whole-heartedly, and bam, princess route.
Yeah, the weird part is Mana didn't need to do any of this at all. In most of these otome villainess setups, the isekai'd villainess changes things so she isn't hated by the capture targets and others, making it far harder for the Saintess to make inroads. In this case, the Crown Prince...
Kind of gutsy for everyone to go along with manufactured testimony... Lumeria is an actual Duchess currently, not just the child of a noble. While they are equals "while at school", siding with future nobility over current high nobility is a ballsy choice.
what's also weirdly stable about this particular otomé subgenre, is the villainess is a ducal daughter fiancéd to a prince. I can't remember seeing one where the villainess is a foreign princess, or a count's/earl/viscount/baron/etc daughter. Or even something outside of fiancé, like the...
haha, I love MC's "Oh, that's the lawyering/excuse you are trying on me? I'm going tell your mother, let's see what SHE has to say about your 'reasoning'"
Wow! It takes amazing stupidity and thirst (and/or brazenness) to be the fiancé of the (currently, but not for long) crown prince, and in front of the entire court offer to be a visiting foreign king's bride.
... didn't Sheena already say she had a Philosopher's stone in her head? It feels weird they didn't acknowledge that, like 'we need another one or we can't use hers cause X... did MC literally just forget she said that?