She's just a regular, sweet-looking college student by day. But by night, she's a part-time assassin — and she's about to face her toughest target yet.

Taeko and her husband, Jiro, are living a peaceful existence with son, Keita. A tragic accident brings the boy's father, Park, back into her life. Taeko throws herself into helping this deaf and homeless man to cope with pain and guilt.

In a world on the brink of collapse, a talented gamer takes the lead in a series of challenges to win ownership of a massive virtual reality universe.