Minor plot hole?

Aionic said:
In Vol. 5, Naru takes Mutsumi onto the Hinate House roof to tell her that Keitaro is the one Mutsumi made the promise with. After hearing Naru's unclear explanation, Mutsumi tells Keitaro that she'll go and tell him. Then, later on in that chapter, it's revealed that Mutsumi actually told Keitaro that Naru loved him.

What confuses me about this is that Mutsumi doesn't regain her memories until towards the end of Vol. 7. How did she know to tell Keitaro that Naru loved him if she didn't remember what happened 15 years ago?

The other lesser plot problem is in Vol 9. In Vol. 9, Naru freaks when Keitaro reveals to her that he loves her, not speaking for him for weeks. This, after Keitaro had only recently risked his educational future to stay by her side when she was sick, struck me as a cold thing to do. It also struck me as an illogical thing for her to do when she had come close to confessing and kissing Keitaro in the past, and gone as far as to ask Keitaro to pick her or Mutsumi. When I read Vol. 9 this heartless, out of character action by Naru really bothered me... I'd loved her to bits up until that point.

Aionic said:
Vol. 6: The thing is, Naru didn't mention anything about herself. I don't see how Mutsumi came to the conclusion that Naru wanted her to confess for her to Keitaro? It seemed completely random. It started to make sense once Mutsumi regained her memories, but that's the problem - she didn't have her memories when she confessed to Keitaro for Naru.

Vol. 9: Somewhere in Vol. 8-9, Naru was actually about to confess to Keitaro (it was when they were getting on the place from the turtle island), only for something to end up stopping her. For her to flip like she did shortly after that over Keitaro doing what she attempted to was stupid - to me at least. Her reacting like that was something I would've expected to see prior to her getting into a tug of war for him with Mutsumi, when her feelings were still unclear - not after.