Immediately after Elena’s Bad Side rips Shuuichi’s head off, Elena’s Meek Side comes out and apologizes for doing something so rash. Claire, her head now exposed, rushes Elena in a rage but is quickly overpowered and upended. That’s when Elena realizes it’s her sister inside Shuuichi. Elena disputes Claire’s assertion it was wrong for their parents to die since they were both immoral people. After receiving a phone call, she gives Claire a coin and withdraws.
Fearing Shuuichi did not survive his beheading, a tearful Claire prepares to shoot herself, thus honoring their promise to each other. She’s stopped when Shuuichi’s head wakes up. He may not currently be what one would consider “alive”, but he’s not about to let Claire kill herself before he’s dead for sure. It’s a damned close call, but a sign that Claire still takes their promise seriously.
They meet the alien at the abandoned motel, and he gives them a bit of an infodump, though to be fair, the two could use one, as much in the dark as they are. Meeting Elena raised more questions than it answered. He uses the coin Elena gave Claire to produce a healing drink from the vending machine that fuses Shuuichi’s head back to his body.
As he heals, Claire climbs out of him, and the Alien is impressed with her bod. Heck, because he copied the ideal male body so accurately, he even gets a little horny, asking if he can cop a feel before Claire kicks him. Then he uses one of her hairs to copy his body, to show Claire how the coins make you transform into your “ideal self”.
Of course, in Shuuichi’s case, he transformed into Elena’s apparent ideal version of him: the manic cartoon dog strap on her bag. But if they “gather” 100 of the Alien’s coins, which are the embodiment of his fellow aliens in data form, they’ll be able to transform into an invincible superhero, able to bend the world to one’s will.
When Shuuichi’s neck is repaired and he transforms back into a human (with a nasty neck scar) Claire pulls him into a dramatic hug, so glad she is that he’s okay. She tells the Alien they’ll give the offer some thought, and they take their leave. When Shuuichi laments that they’re in such a big mess, Claire retorts that her life has never been better since she met him, and found a place by his side (and yes, inside his mascot form).
As his bond with Claire continues to evolve and deepen—one could say they’re becoming even more of a single unit—Shuuichi finds his personality evolving along with it. At school, he doesn’t suffer bullies and easily overpowers one.
He can smell Mifune coming and makes her attempt to find out what’s up with him as awkward as possible by asking her a not-so-hypothetical question about what she’d do if the world were ending because someone she knew gained the power to end it. Mifune can only nervously laugh it off, but he’s pleased by her very normal answer: she’d do everything she could to protect her family and friends and to get the bad guy to stop.
Shuuichi greatly values normalcy, as much as Claire doesn’t value it. But it’s clear he’s already left the world of the normal, swept into the orbit of the very abnormal Aoki sisters, perhaps never to return. He doesn’t want Claire to die, and yet he doesn’t exactly seem happy about the turn of events that has to tightly tied their fates together.
This results in him musing in meta fashion that he’s not the main character here, and there are things at work of which he and Claire have yet to scratch the surface. But a good start is the mountains where the Alien spaceship crashed. Not only will they find more coins, but more Gatherers like them, and more answers.
It will be dangerous, but Claire assures Shuuichi that he shouldn’t worry, because he has her, ready willing and able to make up for his weaknesses, act when he can’t, and if it all goes horribly wrong, die beside him so they’ll never have to feel alone again.