Next girlfriend up: the Cool Beauty, Eiai Nano; the girl who is not only atop the school exam rankings, but got a perfect score; the girl who is rumored to not be a girl at all, but an advanced AI, supported by her distinctive name. But when Nano and Rentarou’s eyes meet in class and the soulmate magic happens, she’s revealed to be as human as his other girlfriends.
However, things are a bit different with Eiai. Unlike Hakari and Karane, who were fighting for his love from the start, or Shizuka, who wasn’t sure she deserved it, Eiai actively tries to suppress the love for Rentarou that’s been bestowed upon her, hiding behind cold logic and efficiency. That said, she also uses those things as an excuse to suck on Rentarou’s finger when he cuts himself during lab.
(While this is happening, Karane takes her tsundere-ness to new heights by declaring “It’s not like I care about looking at some stupid cells or anything, okay?!”, to which Hakari responds by asking her what she’s even fighting against in life. Chef’s kiss.)
When Rentarou thanks Nano later, she gives a logical explanation for an illogical action, and rejects his offer of a thank-you soda. She feels such gestures, and indeed all non-academic activities such as “having fun” to be meaningless and devoid of value. She goes on to define value as something created only by utility and benefits.
But that night, in her completely undecorated room, Nano finds herself preoccupied with thoughts about Rentarou and unable to focus, even when she writes out hundreds of digits of Pi (“Pi is Life”). The next day she decides to ask Rentarou out, but when he heartily accepts, she then rejects, hoping he would decline.
Nano is convinced in this moment that simply drawing a line in the sand and ending her love via rejection will resolve her current emotional upheaval. But Rentarou has been rejected too many times to let one more faze him. He asks Nano for one date to prove to her that romance is more than just a means to matrimony and childbirth … that it has meaning beyond that, unable to be calculated.
Nano agrees, and I believe it’s largely in part because a part of her wants to go on a date with the boy she suddenly loves, even if she’s as cold and skeptical at the theme park as she was at school. Her scathing commentary on the various illogical and absurd contraptions and practices they go through is well worth the price of admission. “Horse simulator” and “human house” were gold!
But something happens when they ride the Ferris Wheel: her acrophobia kicks in, and creates a crack in her calcified armor. Her hand trembles, and Rentarou can tell she’s afraid and sits beside her. When she grabs his sleeve, he places his hand on hers to steady it, and she interlocks her fingers with his. It’s without a doubt something Nano has never experienced, and she cannot hide her enjoyment.
After that vulnerable moment, the two go over the instant camera photos Rentarou had taken throughout the day, and to her surprise, he can discern her emotions in each one, from boredom to genuine enjoyment. Everyone always calls her emotionless, but that’s simply not the case; they just aren’t watching her closely enough.
That said, she continues to insist this day and everything that happened in it was meaningless and a waste of time, and that she gained nothing. Rentarou is happy she was straightforward as always in telling him what she thought about the date, and prepares to light the photos—which have no digital files or negatives—aflame.
But just as one corner of the photos begins to singe, Nano instinctively rips them away from the fire with a look of sheer panic. Rentarou admits he tried to burn them in order to prove to Nano that the times they had weren’t meaningless and that she did gain something. She may not understand what it is, but when she grabbed the photos it proved she didn’t want to lose it. And she can’t lose what she doesn’t have.
There’s a meaning to good times, and enjoying those times makes life meaningful. Realizing that she was too quick to conclude she wasn’t missing out on anything by avoiding fun and romance, Nano again asks Rentarou out. He accepts, and she makes it official with a surprise kiss, afterwards declaring that she intends to fulfill her desires “without fretting about the means.”
All that’s left is to introduce his fourth and newest girlfriend to the ‘cule, which at this point is a mere formality, especially considering the other three are now thick as thieves. We even get a preview of their future interactions together, as Karane chides Nano for “optimizing his death” when she suggested he kill himself with poison rather than seppuku if he doesn’t do right by them all.
The other girls are a little jealous Rentarou went on a date with Nano, something they haven’t done yet, so Hakari wastes no time suggesting a group date to a pool, which means we’ll be getting the swimsuit episode next week.
Until then, Nano’s intro was fantastic, and her calm deadpan logic hiding an aggressive assertiveness makes for a great new wrinkle to the dynamic that includes Shizuka’s quirkiness and Hakari and Karane’s chaos. I also hasten to add that Rentarou didn’t seek out to change Nano, only to introduce her to a part of life she hadn’t bothered to access, knowing the rewards would far outweigh the inefficiencies.