What begins as a simple trip to buy a new phone quickly turns into a day full of awkward conversations, honest feelings, and moments that bring Hayato and Haruki closer than either of them expected.
The episode 4 of Oh Boy Was I Wrong About Her starts with Hayato arriving late to meet Haruki after struggling to find his way through the massive train station. While catching his breath, he immediately notices that Haruki looks different today. She shyly reveals that she is wearing makeup for the very first time and nervously asks what he thinks. After briefly stumbling over his words, Hayato honestly tells her that she looks very pretty, leaving Haruki both embarrassed and delighted by his sincere compliment.
Although Haruki tries to hide how much his reaction means to her, the conversation quickly becomes awkward when Hayato realizes she dressed up specifically for their outing. Before either of them can dwell on the moment, Haruki enthusiastically suggests they continue with their original plan of shopping for Hayato's first cellphone. She thanks him for the compliment, and the two head off together with noticeably lighter moods.
After successfully buying a phone, Hayato thanks Haruki for guiding him through the process, admitting he never could have managed it alone. Haruki brushes off the praise and asks if he is really happy choosing the exact same phone as hers despite all the other options available. Hayato explains that using the same model will make things much easier because he can simply ask Haruki whenever he has trouble figuring something out.
Haruki is briefly caught off guard by his answer before asking why he did not simply buy the same phone as his sister Himeko instead. Hayato casually explains that sharing everything with his sister would feel a little strange, while relying on Haruki feels much more natural. Although neither of them openly comments on the meaning behind that choice, the conversation quietly hints at how comfortable they have already become around one another.
As they continue walking through the busy shopping district, Haruki suddenly slows down. Hayato assumes her new shoes are making it difficult to keep up, but she quickly admits that the real problem is the outfit she is wearing. The short skirt feels unfamiliar, the thin fabric constantly brushes against her legs, and every gust of wind makes her worry that it could flip upward at the worst possible moment.
Haruki openly describes how uncomfortable it feels to bend over or even walk confidently while wearing clothes she is still getting used to. Hayato awkwardly agrees that it sounds difficult, though he clearly struggles to understand her perspective. Not wanting to suffer alone, Haruki jokingly suggests that Hayato should try wearing a skirt himself so he can experience exactly what she is talking about.
Hayato instantly rejects the idea, insisting he would look ridiculous dressed like that. Haruki refuses to let him escape so easily, teasing that since he is Himeko's brother, he would probably look surprisingly good in one. Hayato is left completely speechless, while Haruki suddenly realizes she is beginning to understand why Himeko enjoyed teasing him so much the previous day. Hayato desperately begs her not to adopt his sister's habits, making the playful exchange one of the funniest moments of their outing.
Leaving the conversation behind, the pair continue exploring the city together. Surrounded by countless stores and unfamiliar streets, Hayato admits he has no idea where to go next because there are simply too many choices. Haruki encourages him to make use of the smartphone they just bought, reminding him that it can instantly search for nearby places instead of relying on guesswork. Hayato eagerly follows her advice, amazed by how convenient the new device already feels.
Using the search function, Hayato quickly discovers an enormous 100-yen store nearby. Even Haruki admits she has never visited one this large before, making the destination exciting for both of them. Curious about what they might find inside, the two happily head toward the massive shop, ready for another unexpected adventure together.
Inside the enormous 100-yen shop, Hayato is immediately overwhelmed by the endless rows of inexpensive products. Every aisle offers something different, and he cannot hide his amazement at how many useful items are available for such low prices. Haruki laughs at his reaction, enjoying the fact that he is discovering the store with the same excitement as someone visiting an amusement park for the first time.
As they browse from shelf to shelf, Hayato carefully picks out several everyday necessities while stopping to inspect countless unusual gadgets that catch his attention. Haruki patiently follows along, occasionally explaining what certain products are used for. Their shopping gradually becomes less about buying things and more about casually spending time together, making the atmosphere feel relaxed and comfortable.
The fun continues when Haruki notices a novelty item designed to measure hand size. Curious, she encourages Hayato to compare their hands using the display. They place their hands side by side, only to discover that Hayato's hands are noticeably larger while Haruki's are much smaller than she expected. The simple comparison leads to another playful conversation between the two.
Haruki jokingly comments that Hayato has broad shoulders and large hands despite often acting shy around other people. Hayato awkwardly responds that physical appearance has nothing to do with confidence, earning another amused smile from Haruki. Their lighthearted exchange makes even the smallest activity feel entertaining as the pair continue wandering through the crowded store.
While looking around, Haruki suddenly spots a pair of matching accessories and briefly imagines how nice it would be if they owned similar items. Before she can seriously consider buying them, she quietly stops herself and changes the subject. Rather than drawing attention to the moment, she simply continues walking beside Hayato, keeping those thoughts to herself as they move deeper into the shop.
After leaving the store with several inexpensive purchases, the two continue strolling through the city while talking about the day's events. Hayato happily admits that he never expected shopping to be this enjoyable. Spending time with Haruki has made unfamiliar places feel much less intimidating, and he appreciates how naturally she guides him whenever he becomes uncertain about something.
Haruki smiles after hearing his honest words but also admits that she has enjoyed herself far more than she expected. Even simple conversations have been enough to keep the outing fun, and she realizes that being with Hayato never feels forced or uncomfortable. The pair continue walking at an unhurried pace, letting the lively streets around them fade into the background as their conversation naturally flows from one topic to another.
Their growing comfort with each other becomes even more obvious as they casually tease one another without either of them feeling embarrassed for long. Whether discussing clothes, phones, or the strange products they found in the shop, every topic turns into another opportunity for laughter. The easy rhythm of their conversation reflects how much their relationship has changed over the course of the day.
Eventually, the afternoon begins drawing to a close, and both of them realize they have spent far longer together than originally planned. Even though the shopping trip has accomplished its goal of buying Hayato a phone, it has also become an opportunity to create new memories together. Neither of them openly says it, but the outing has clearly strengthened the bond they share.
The episode ends with the pair making their way home after a day that turned out to be much more meaningful than either of them expected. What began as a simple errand to buy Hayato's first smartphone gradually became a chance for them to learn more about each other through small conversations, playful teasing, and shared experiences. Neither dramatic events nor grand confessions are needed, as the episode lets their growing friendship speak for itself.
Before parting ways, Hayato sincerely thanks Haruki once again for accompanying him throughout the day and helping him navigate both the city and his new phone. Haruki responds with her usual modesty, but her smile makes it clear that she enjoyed every moment just as much. Their farewell feels warm rather than awkward, showing how naturally they have become part of each other's daily lives.
Oh Boy Was I Wrong About Her Episode 4 delivers one of its most charming episodes so far by proving that ordinary moments can be just as entertaining as dramatic ones. The pacing remains relaxed without feeling slow, allowing Hayato and Haruki's personalities to shine through natural conversations instead of forced situations.
The comedy lands well thanks to Haruki's playful teasing and Hayato's awkward reactions, while the quieter moments give their relationship believable emotional growth. There is very little action, but the episode never needs it because the focus stays on the chemistry between its two leads.
Overall, Episode 4 is an enjoyable slice-of-life chapter that balances humor, warmth, and character development, making the simple shopping trip feel surprisingly memorable.
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