It was probably present before, but this week more than others I noticed the common theme between the two “couples” in Subete ga F: Shiki and Shindo in the past; Saikawa and Moe in the present. In both cases, the men are unfulfilled, wanting more freedom but being tied down; fearing the very freedom they crave because of what it might cost.
And by the end of the episode both couples arrive at a turning point, as well as a philosophical impasse of sorts. The apparent murder case, so prominent last week, takes a back seat to how being in the Land of Magata Shiki is affecting Saikawa and Moe, even as they act out a very similar scenario to that of the now-dead couple.
Suffering vivid dreams of the day her own parents died, Moe ends up pumping Shindo’s still-in-shock widow for information. Losing her husband has left her untethered, floating free; but she doesn’t know what to do with herself, so she bakes too many cookies and is happy to tell Moe whatever she wants to hear about the day Shiki’s parents were killed.
But no matter how many details Moe learns, she comes no closer to understanding Shiki or her crimes, to say nothing of accepting them. It’s when she confers with Saikawa that a rift starts to form between them: the playful flirting replaced by increasingly harsh debate over who and what Shiki was.
Bright as she is, Moe wears her heart on her sleeve and owns herself. She doesn’t feel “tied down” by having one personality she settled on as she grew and matured as a human. Saikawa, however, feels more trapped, both by his job and by the decision most all people make when they grow up to eliminate the contradictions and choose one personality with which to interact with the world…and fit in.
He admires Shiki for never doing that even as she grew up; he even believes she was fulfilling more of her potential as a human than he or Moe or hardly anyone else. He even goes so far as to call her “pure”, which considering her murders and fooling around with her uncle, would sound strange to anyone with conventional ideas of love and ethics…ideas Moe happens to have.
To Moe, when Saikawa starts waxing poetic about Shiki, even though he’s making no direct judgments on her, she feels rejected; it’s as simple as the guy she likes liking another girl more than her. But Moe does have one variable in her favor Shiki lacks: she’s still alive.
The bookend-ing of flashbacks completes with Shiki purchasing a survival knife for Shindo, calling it “a tool to free oneself.” That could mean many things. Shiki’s parents clearly are unaware of the affair she and her uncle are engaged in. “Freeing oneself,” in that case, would mean making sure that affair stayed secret. Cutting the ropes that tie you down, to be with Shiki, the one who glides over all.
That knife could be the weapon that killed Shiki’s parents, and the doll in the room is Machiru, one of the personalities she carries. By gifting him the knife, Shiki is also forcing Shindo’s hand one way or another; asserting her authority over all these adults in her life by the primacy of her intellect, not things like familial bonds dictate who’s in charge.