I still don't get the relationship between Ayari, Mariya, and Shizu. Which one was bullying Ayari? Mariya (boy), or Mariya (girl)?
From the moles and the way that Mariya (boy) acts, it is indeed Mariya (boy) who was bullying their cousin. But it's also implied that this stuff happened before the twins swapped places. So did they swap as children, swap back for school, and then swap again for high school? What's going on here?