No Ichirou at all this week, giving the episode ample time to continue developing Hiro. The high of offing over 50 2channelers to avenge his mother has largely worn off, and he spends most of the time in bed. He remembers perhaps the first time he saw someone die—a track jumper—and how he felt a light going out when the life was extinguished.
A very patient and caring Shion still wants to believe Hiro is not the killer, but Hiro can’t go on that way, and tells her the truth, as well as shows her that he’s a machine now. When she refuses to accept it, he takes her for a harrowing ride and almost drops her.
Shion doesn’t explicitly beg for her life, she merely begs Hiro not to leave her and her grandmother. The indication being, no matter what he’s done, he has a home with them. Hiro looked very ready to drop Shion to her death, then proceed with the extermination of Japan’s whole population.
He does this because killing people makes him feel alive, and perhaps makes him forget that he’s not a person in the same sense anymore. But up there in the sky, Shion changes his course. She believes even if he doesn’t turn himself in, he can try to make things right by saving as many or more people than he’s killed. The flight is a baptism of sorts into the Church of Goodness.
Cut to the life of a salarywoman with terminal cancer being consoled by her co-worker/boss, considering jumping in front of a train like the guy Hiro once witnessed, but she doesn’t. She wants to live, so desperately that she heeds a tweet directing her to Hiro, who eradicates her cancer in moments. She’s back at the office, good as new.
Hiro doesn’t stop there, and Shion accompanies him as he heals one infirm or chronically-ill person after another, gaining their eternal gratitude. His twitter presence starts to expand, and before lone, he’s achieved the goal of saving more people than he killed.
Shion wants to keep it going. She and Hiro go on a celebratory flight, and when Hiro asks if this has gotten boring and Shion answers in the negative, don’t think I didn’t wonder whether he’d turn evil again and drop the poor young woman to her death.
Instead, Hiro seems to have filled the void left by his deceased mother with Shion, committing himself to her “forever.” Shion doubted she’d live a long life, but being with Hiro will likely change that, both from a medical and emotional standpoint. She’s no longer alone, and no longer has to worry about her cancer-prone genes.
All she has to worry about is the SWAT team stealthily arriving at her apartment in the middle of the night, likely ready to strike without regard to collateral casualties. Either Hiro can take them out without Shion or her granny getting harmed, or they do get harmed and he’s able to save their lives.
Either way, staying in that apartment is no longer an option. No matter how much good he’s done, it hasn’t erased the bad in the eyes of the law, which will never stop hunting him.