A Cursed Birth

The birth of Yuriko's first daughter, Rika, should have been a joyous occasion, but it wasn't. When Yuriko looks at Rika, all she sees is an iguana. Not long after, Yuriko gives birth to another girl, Mami. When Yuriko looks at Mami, she sees a human, so she ends up loving just Mami. Rika develops a quiet, inconspicuous personality. One day Rika coincidentally hears Yuriko screaming, "That girl is an iguana from Galapagos!" When Rika looks in the mirror, her reflection is that of an iguana. Nine years pass, Rika is 17 years old; Mami 15, and they both attend the same high school...