A simple misunderstanding turns into an unexpected reunion that changes everything. As old friendships return, one energetic middle-schooler decides Haruki's life needs a complete makeover.
Oh Boy Was I Wrong About Her Episode 3 starts with the awkward misunderstanding from the previous encounter continuing as a woman mistakes Haruki for Hayato Kirishima's girlfriend. Before Hayato can properly explain the situation, it becomes clear that the woman is actually Himeko, Hayato's younger sister. The surprise grows even bigger when Himeko immediately recognizes Haruki as "Haru-chan," while Haruki realizes that the cheerful girl standing before her is the same Himeko she knew years ago. Their emotional reunion instantly breaks the tension, leaving everyone shocked by the unexpected connection.
The following day at school, Haruki can barely stay awake after spending the entire night chatting with Himeko. Although she insists she simply couldn't sleep, her classmates quickly notice the exhausted look on her face. The reason becomes obvious through flashbacks of the previous evening, where Himeko excitedly talks about how beautiful Haruki has become. She laughs that Haruki's disguise had fooled her completely because she had always believed Haruki was a boy growing up. Their conversation naturally shifts to Hayato, with both of them teasing his old-fashioned habits, from not owning a cellphone to cooking meals that seem more suited to an older generation. Their excitement over reconnecting keeps the conversation going until late into the night, explaining why Haruki arrives at school running on almost no sleep.
Watching Haruki smile at her phone makes the other students curious. Hayato casually asks if she has a girlfriend, expecting to tease her a little. Flustered, Haruki hesitates before unexpectedly playing along and proudly announces that she does. She even shows everyone a picture of Himeko, explaining that they recently reunited after years apart and ended up talking for hours about their childhood memories. The class immediately comments on how cute Himeko looks, while Hayato quietly accepts the explanation even though he knows the real story behind the photo. Before the teasing can continue, the teacher arrives and starts class, saving Haruki from even more embarrassment.
During a break, Haruki thanks Hayato for helping her avoid an awkward situation earlier. Hayato reveals he has a favor to ask, but his hesitant approach briefly makes Haruki panic before he finally admits the truth. He had overslept, skipped breakfast, and forgot to buy lunch, leaving him with nothing to eat. Relieved, Haruki happily agrees to share her homemade lunch. Hayato's carefully prepared meal immediately catches her attention, especially the hamburg steak and vegetables. When Haruki learns he cooked everything himself, including enough portions for Himeko, she can't hide her admiration. The contrast between Hayato's organized home-cooked meals and her own convenience store diet becomes impossible to ignore.
As they eat together, Haruki enthusiastically tells Hayato about her conversation with Himeko. She admits Himeko knows everything about fashion brands and makeup, subjects she knows almost nothing about herself. Hayato casually invites Haruki to visit his home after school because Himeko will also be there. Although surprised by the invitation, Haruki accepts without hesitation. Hayato then remarks that Haruki's polite and refined appearance around strangers is simply an act, hinting that he understands the difference between the person everyone else sees and the energetic friend he remembers from childhood. He almost says something more before deciding to keep his thoughts to himself.
School ends, and Himeko wastes no time waiting outside to pick Haruki up. Their classmates are surprised to see someone waiting specifically for Haruki, since she never seems like the type to spend much time socializing. The heat quickly overwhelms everyone, but Himeko remains as energetic as ever. Once they arrive at the Kirishima house, Haruki unexpectedly finds herself becoming the center of attention. Himeko immediately begins criticizing Haruki's wardrobe, pointing out that most of her clothes are old, oversized, faded, and nearly identical to what she wore years ago as a child. Even the stylish outfit Haruki wore when they first met again is described as a rare exception rather than the norm.
Instead of simply teasing her, Himeko transforms the conversation into a full-scale mission. Declaring herself the instructor, she announces that Haruki desperately needs an entirely new wardrobe. Hayato agrees to postpone their cellphone shopping plans so Himeko can dedicate Saturday to buying clothes for Haruki instead. Although overwhelmed by Himeko's enthusiasm, Haruki eventually accepts the idea while Himeko warns that if they're going to do this properly, Haruki needs to prepare herself for a long day of shopping.
The mood settles down once everyone moves into the kitchen. Himeko reminds Hayato that despite Haruki's rough personality, she is still a girl, encouraging him to help while preparing dinner. Hayato joins Haruki in the kitchen before suggesting they all stop by the grocery store together to pick up fresh ingredients. Once they return, nobody is allowed to sit around doing nothing. Hayato assigns each person a task, asking Himeko to grate garlic and ginger while Haruki gathers bowls and spices. Even as a guest, Haruki is expected to help because, according to Hayato, she is family enough to be included.
The teamwork soon turns into a lively dinner filled with laughter. Haruki immediately falls in love with Hayato's cooking, eagerly digging into the hot meal despite repeatedly burning her mouth because she cannot wait for the food to cool. Surrounded by Hayato and Himeko, she quietly realizes how long it has been since she last shared dinner with other people. The simple meal gives her a sense of comfort she hadn't realized she was missing. Hayato notices the atmosphere as well and gently suggests that, since dinner is usually just him and Himeko anyway, Haruki should start joining them regularly. Surprised by the invitation, she asks why he would want that. Hayato answers with complete sincerity that she's Haruki, and that's enough because they're friends. Deeply moved, Haruki accepts the invitation, promising to come back again as the evening comes to a warm and heartfelt close.
Himeko's makeover project begins the moment the weekend arrives. Armed with a carefully planned shopping route, she enthusiastically explains that they can visit every clothing store by moving through the main shopping street before looping back through the department store. Haruki, who initially seemed hesitant about changing her appearance, surprises Himeko by arriving full of determination. She admits that once she decides to do something, she wants to commit to it completely. More importantly, she thinks it will be fun to surprise Hayato with a brand-new look. Himeko notices that even the clothes Haruki is wearing today already make a difference because some of them are borrowed. Looking at her childhood friend dressed differently, she realizes that Haruki finally looks like the girl she never recognized years ago.
While the shopping trip gets underway, the story briefly shifts to Hayato visiting his mother in the hospital. She offers him some food before updating him on his father's recovery, explaining that the surgery was successful even though he still experiences tingling in his fingertips and will soon move into a rehabilitation ward. She also asks about Himeko, wondering if she is still struggling emotionally. Hayato simply reassures her that Himeko is doing well and is spending the day out with a friend, choosing not to reveal every detail of their growing circle. After a short conversation, he leaves the hospital, relieved to hear encouraging news about his father's condition.
On his way home, Hayato unexpectedly runs into Minamo Mitake, who is arranging flowers made from freshly pruned vegetables. He compliments her creative idea, and the two enjoy a brief conversation before Minamo's energetic grandfather suddenly appears. Completely misunderstanding the situation, the old man assumes Hayato has upset his granddaughter and immediately confronts him. Even after Minamo tries to explain that nothing happened, her grandfather continues questioning Hayato's intentions and demands to know why he approached her in the first place. Caught off guard, Hayato honestly replies that Minamo reminded him of a little girl from his old neighborhood. That answer finally calms the situation, allowing everyone to laugh off the misunderstanding before Hayato and Minamo continue talking more peacefully.
As they prepare to leave, Minamo accidentally keeps holding Hayato's hand before quickly realizing it and apologizing in embarrassment. Hayato reassures her and comments that her grandfather clearly cares about her very much. Although the conversation is short, Hayato quietly notices that Minamo's expression reminds him of Himeko during an emotional moment from the past. Before saying goodbye, he asks if he can visit the vegetable garden again someday. Minamo happily agrees, ending their meeting on a warm and hopeful note.
Back at the Kirishima house, Hayato discovers that Haruki is skipping dinner for the first time since accepting his invitation. Himeko explains that the exhausting shopping trip completely wore Haruki out, forcing her to head home and throw together a quick meal instead. Hayato jokingly remarks that he never imagined Haruki could actually become tired, while Himeko smiles to herself after remembering everything they accomplished together. She laughs about how funny it would be to dress Haruki in something especially feminine just to watch Hayato become flustered. Watching her brother prepare dinner, Himeko quietly realizes that Haruki is putting genuine effort into changing herself, and that effort seems motivated entirely by Hayato.
The episode closes with a lighthearted extra scene showing Himeko chatting online with her friend Saki. During their conversation, Himeko excitedly shares that she recently reunited with Haruki and has been spending time together again. Saki is stunned after seeing Haruki's photo because she remembers hearing descriptions that made Haruki sound nothing like the beautiful girl in the picture. Himeko laughs and insists that despite the dramatic change in appearance, Haruki is still exactly the same person on the inside, especially whenever she's around Hayato. Completely confused by the contradiction between Haruki's appearance and personality, Saki is left speechless as Himeko ends the conversation after being called for dinner.
The episode ends with Saki staring at Haruki's photo in disbelief, unable to reconcile the elegant young woman she sees on the screen with Himeko's description of the energetic childhood friend she has always known. That final reaction perfectly captures Episode 3's central theme: appearances may change dramatically, but genuine friendships remain exactly the same.
Oh Boy Was I Wrong About Her Episode 3 delivers a warm blend of comedy, friendship, and heartfelt slice-of-life moments. Himeko quickly becomes the episode's standout character thanks to her endless energy and determination to help Haruki reinvent herself, while Haruki's gradual acceptance of her friends' kindness creates several genuinely touching scenes. Hayato's quiet support, from sharing meals to inviting Haruki into his family's daily life, adds emotional weight without slowing the pacing. The shopping plans, family interactions, and Minamo's humorous misunderstanding keep the episode entertaining from start to finish, making this one of the most charming and emotionally satisfying installments of Oh Boy, Was I Wrong About Her so far.
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