Ringo’s measures grow more and more drastic as she attempts to fulfill her destiny as written in Momoka’s diary, attempting to rape Tabuki in his sleep twice. The second time, she has drugged him with cake and is stopped by Shoma, just as Yuri arrives. They escape, and Shoma learns Ringo’s true motivations. The diary takes a fall, and is snatched up by a passing motorcycle – likely the woman with the black penguin. Shoma is hit by a car after saving Ringo’s life.
Ringo just happens to see her father at the zoo gift shop his other family – definitely a potential blow to one’s mental balance – and she didn’t have much to begin with. She tells Shoma (and us) that she has to carry Tabuki’s baby at all costs – not for her, but as duty for her family. That’s why she’s going so far to bed him. All this attempted rape and duty to get pregnant juxtaposed with such silly romantic (and western) daydreams present quite the stark contrast.
The line between Ringo and Momoka is definitely beginning to blur, and her obsession has progressed from creepy to downright life-threatening (and totally morally wrong). She is responsible for Shoma getting hit by a car. I doubt this will snap her out of her percieved duty and it surely won’t convince her to enter a more normal, reciprocal relationship with Shoma (if he lives), but in any case, she’s lost half her diary – meaning she doesn’t know what her next step will be.