Yuu likes working at her family’s bookstore, because it lends her some insight into her friends via the kid of literature they purchase. She’s primed to excoriate Touko when she shows up during her shift to buy a raunchy yuri novel, but it turns out she doesn’t know the story takes such a turn until later, and then she’s contrite.
I was mistaken about what Koyomi was working on; it wasn’t a love letter, but a novel, something she took on and didn’t let things like fatigue or looming midterms to keep her from finishing it. She lends it to Yuu to read, but Yuu is focused on midterms first and foremost. She’s also constantly telling herself that Maki is wrong. He must be.
He may claim to see affection for Touko in Yuu’s behavior, but she’d insist she’d worry about anyone she deemed fragile and in need of someone for support—even if it wasn’t Touko. She’d be “happy with anyone,” to which I say, isn’t she assuming a lot, not tomention missing the forest for the trees?
When Maki slickly declines studying with Yuu in the library the moment Touko comes up from behind her, Yuu ends up in a series of study sessions with a senpai with a crush on her, and that crush is only intensifying. The first time, Yuu isn’t sure how to repay Touko for tutoring her, but Touko simply says she did it because she wanted to, and Yuu will “just have get used to it”.
Again, Yuu insists to herself (and us) that she’d be happy studying with anyone; that she didn’t choose Touko. Still, she admits she doesn’t hate being chosen. There’s anyone, and there’s the person in front of you. Yuu may say she’d be fine with anyone, but the fact remains, she’s fine with Touko, and so not opposed at all to “getting used” to being around her.
To that end, when the library is completely full, it is Yuu who invites Touko to her place to study, not t’other way round. Indeed, of the two of them only Yuu is clear-headed (and bold) enough to suggest they continue their studying in private.
This is not, then, a matter of will, only intensity for Yuu. Touko is desperately and adorably nervous alone in Yuu’s room as she prepares tea. She’s delighted to meet Yuu’s mom, older sister Rei, and Rei’s boyfriend (who “jokes” that Touko might be Yuu’s girlfriend). She’s elated to learn more about Yuu, who talks about herself so infrequently at school.
It isn’t until Touko’s longing eyes meet Yuu’s that Yuu asks her if anything’s wrong or if she’s not feeling well or too hot. Reading Touko’s blushing face finally clues Yuu in on what’s going on, and she confirms it by taking Touko’s hand and reading her very quick pulse. Touko is taken aback by Yuu’s boldness, but that boldness is tempered by the fact she’s not acting out of lust, but pure logic.
And that logic is the barrier Yuu must cross. If she “waits for her heart” to tell her she likes Touko, she’ll be waiting forever. She has to move beyond the probability that someone, anyone else could make her happy when there’s already someone right there, and their being there isn’t just a matter of coincidence or convenience. Yuu is overthinking and over-analyzing things. She was alone. Now she’s not. Go with that.
Meanwhile, as she’s leaving Yuu’s house, Touko is a completely, helplessly open book to Rei and boyfriend. Touko is bashful when Rei tells her to “take care” of Yuu; and Touko is way too eager to learn the recipe for the cheesecake Yuu likes so much. That’s why, in addition to the recipe, Rei sends Touko a photo of Yuu sleeping on the floor.