Onnanoko

1. Chapters 1-4: "A Girl?" A strange disease is turning boys into big breasted girls. The disease makes them very, very luxurious. The story is about a boy affected and the way he returns to normal.
2. Chapters 5-9: "Something Like That Too". High school life: friendship, romance, and gangbangs.
3. Chapter 10: "Pleasure Train". A girl riding a train sees another girl being raped nearby, but none of the other passengers seem to notice. What will happen to her?