Has Miki fallen too hard?

It's summer, and Miki Yoshida is learning all about love. Her senior year has blossomed with promise ever since she gained Hiro Sakurai's confidence. Now, she's resolved to keep his trust as he reveals more about his secret mission and warns:

"Don't get involved."

But Miki fears his work might do more harm than good, and she takes control--with disastrous results. How can trying to make things right turn out so dangerously wrong?