To borrow a couple of sophomoric double entendres from Blue Snow, Okuma is in a tight spot; between a rock and a hard place. He admires and idolizes the pure, perfect Anna (who shows no signs of being anything other than that, with no hidden dark side), but is being forced through blackmail and coersion by Ayame to undermine her.
I will say, both Ayame and Okuma are well-positioned in terms of hiding in plain sight, and Okuma’s story of how he was ostracized when his “terrorist” father was put away and met the “guardian angel” Anna in grade school (something she doesn’t remember) that inspired him to live a purer life, is a great cover story.
But Ayame is stripping the primacy of his goal away as she exposes him to more and more misbehavior, as Okuma can’t deny the thrill he gets from finding ultra-rare smutty mags in an abandoned cabin, like buried treasure. When the imagery therein is copied and distributed around school, Anna is so ignorant to its insidiousness she herself frames a picture of a girl performing fellatio in the StuCo office!
That gets to another bigger social issue about the whole anti-dirty-joke law and PM devices: real-world Japan’s brith rate can’t keep up with its aging population; if laws were put into place to block the people’s natural sexual development and keep them in the dark about reproduction (if such a thing were even possible), it would be a de facto form of population control. Maybe the Japan of Shimoneta wants the population to decrease.
In any case, Anna’s powerful, driven politician mother is introducing a new bill that would step up the oppression even further, legalizing the monitoring of every action and conversation in the country. With no stones unturned, Ayame’s terrorism could not continue, her crusade to educate the ignorant masses would end in defeat, and most importantly, the people would have no privacy whatsoever in the new surveillance state. Ayame makes sure to impress upon Okuma that while she has her own selfish reasons for doing what she does, she’s also working in best interests of a free society.
Thus, the fight must not only continue, but be stepped up. Ayame dresses Okuma up like a Blue Snow decoy to give students dirty word eye exams during school physicals while she steals the boys’ urine samples, hoping to start a scandal in the school when tests reveal high levels of masturbation. The operation also results in Anna yelling out the howler above.
Anna isn’t portrayed as an idol fool here, but actually comes quite close to exposing and capturing Okuma-in-drag more than once, and presses her pursuit of him with heretofore unseen (and somewhat frightening) superhuman strength and speed. Game Over for Okuma and Ayame is rarely less than a few seconds or inches (heh-heh) away, but with one last misdirection, Ayame manages to save Okuma and make off with the urine.
The fact that the entire final exchange is witnessed by a painter in a crow’s nest—likely the same painter who painted the pure “Sound of Music”-style painting Okuma lingered on—means the ranks of Ayame’s SOX are likely to swell in the near future, which bodes well for defeating Anna and stopping her mom’s overreaching legislation.