Ai and Nami have been best friends since childhood. Since Nami lost her parents six months ago, she has lost her energy. Finally, Nami stops appearing in front of Ai, and when Ai, worried, visits Nami's uncle Kita, she...she witnesses Nami being played with by men. Ai is found in the north, kept in a cage with Nami, and is forced to commit lewd acts to become her plaything.