spoilers correction*
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Sorry I got it mixed up. Ruri was not cursed, she was a weak demon who was about to die but she refused to die because she made a promise to the demon king to take care of bunny until she turns into an adult, so ruri turned into the notebook so she can still be somehow alive and help bunny
As for the curse, the crown prince (bunny's ml) was cursed with demon energy. everyone believed that he will not survive but bunny found out about it. Bunny sneaked into the prince's room while he was sick and asleep. She took away the demonic energy and then the crown prince was healed. The crown prince grew attached to bunny and promised her to get married once they are adults.
I KNEW IT SHE'S THE DAUGHTER OF THE BROTHER which basically confirmed he's her uncle
• bunny is the child of demon king and the hero
• the hero died not because the demon king killed him but because his divine energy was to weak so the demon energy took over him
• ruri did not leave bunny... she turned into the notebook that bunny keeps inside her stuffed bunny toy. (from what i remembered from the novel, ruri is a classified as a weak demon but she was favored by the demon king. she was cursed(? novel readers correct me if i'm wrong since i'm trying to recall lol) by another demon for protecting bunny because ruri's goal is for bunny's happy ending
• the ML is not the silver hair boy. it's the crowned prince and no, there is no love triangle.
• there will be a fake child (homunculus) and she's the "og fl" from the original story where bunny was seen as a villainess. she was created by a mage and a witch from the hero's blood