In one of Takafumi’s memories from grade school, he’s bullied by some boys for reading an innocent fantasy LN, only to be bailed out by Fujimiya, who may still looks like a demon to lil’ Takafumi’s eyes, but he’s genuinely moved by her support. Present-day Fujimiya remains mortified that this is how Takafumi viewed her, especially as she became more girly in middle school.
But that was then and this is now, and Fujimiya has high hopes for her newly-rekindled relationship with Takafumi. When she learns he got cash from Ojisan for his birthday which he spent on a coffee grinder and some fancy beans, she decides to send him a “gift” of her own.
This comes in the form of a photo of her in a swimsuit from middle school, which while cute, even she realizes in hindsight might’ve been a questionable choice. But hey, watching your crush’s childhood memories in which you’re a loathsome devil spawn does weird things to the mind!
That said, Takafumi couldn’t be more tactless when his first instinct is to ask Siri how to delete the photo from SM, and then he gets an alert about a sale on coffee beans and once again leaves Fujimiya with his uncle. When he almost spills his coffee, he casts an ice spell that freezes her, then melts her with flame.
The result of all this is that Fujimiya is soaked and needs to take a shower to warm up. Ojisan leaves the apartment to give her her privacy, but Takafumi enters when she’s wearing one of his shirts and nothing else. Again, after watching a younger Takafumi portray her as a monster, seeing him react to seeing her inspires her to uses this “pinch” as a “chance”, in Ojisan’s words.
Unfortunately, Takafumi proves as dense about Fujimiya’s feelings and intentions as Ojisan is about Elf. He considers it shameful that he should feel this way about looking at a “good friend”, and when Ojisan arrives on full battle alert (due to Takafumi using the wrong flag signal) Takafumi asks him to delete his memories of seeing Fujimiya. Of course, Fujimiya stops the spell, and warns Takafumi she’ll dress like this again if he wipes his memory.
When Fujimiya turns twenty, she and Takafumi and Ojisan have a modest but warm celebration drinking their preferred choice of canned alcoholic beverages and watching more of Ojisan’s misromantic adventures with Elf. Elf is astonished he was able to restore the city barrier, and also recalls when Ojisan (or “Orc Face” as she calls him) saved her from a venom dragon.
After a bit more of their usual repartee, Uncle suddenly takes her by the hand and draws her to his side as they walk through the town market. Elf is shocked by this sudden bout of lovey-dovey behavior, but she can’t hide her enjoyment of it either. When it looks like he’s ready to take her up to his room, it isn’t until he gets his door open that it’s revealed he only needed someone to lean on.
He slams the door in her face, locks said door, and falls immediately asleep. The next morning Elf shows signs she cried herself to sleep. In short, Ojisan’s an unintentional villain, and Fujimiya must do everything in her power to keep Takafumi from turning out the same way.
In the present, Ojisan demonstrates how he can in no way hold his liquor, and then offers to take Fujimiya home via flight. Ojisan, Fujimiya, and Takafumi end up flying through the air upside down, with Ojisan merging the fantasy of the game he was playing with reality, and his nephew and his friend are simply along for the ride.
The end credits are cut short by an extra segment in which Ojisan once again gives Elf the wrong idea by sucking out poison that turns out to have aphrodisiac effects on Elf. When his doting closeness gets to be too much for her, she merely socks him in the face with a swift kick. Fujimiya asks Ojisan if he still has some of that poison so she might be able to use it on Takafumi…because a pinch is a chance!