@gregger
I agree with everything you Said
• Hiro is acting like the horse trainer that's dangling a carrot on a string in front of MC. She's completely unreasonable unless things change plus she technically is engaged
• Erika on the other hand is literally friend zone incarnate at this time. She's fully enjoying her big family. Yes it's true MC and her are very close and had some deep moments, but Erika based on how they're really chummy with one another has taken on the role of MC's BFF or close confidant. Potential love interest may be but that's the furthest thing from what she wants right now.
And then there's Sachi
Sachi's case from what her friends said during the festival & flash backs already make her out to be a base level BroCon
However now that she knows her Bro and herself aren't blood related coupled by MC's blood Father's whispering sweet legal possibilities, sachi's BroCon base has begun to morph and drive her to Win Total affection as the main love interest
I'm guessing the Father probably figured out Her BroCon base and manipulated that by saying it'll be perfectly legal once MC takes up his birthright a Last name
If anything Sachi is poised to be the tragic heroine by the end of this
Unless of course we go full OREIMO ending