I didn't read source material for this manga so i am only guessing that romance with Adjest would have been calm and sweet(and i like gap moe that Adjest has; cold but can be sweet), its a shame.
I hope atleast author for this manga adaptation make Romantica romance good.(bad part is i don't like modern tsunderes like Romantica as romantic partners, they switch between tsun and dere constantly so this will be harder for me to like, i hope she atleast turns to a classic tsundere for MC)