The episode 5 of Oh Boy Was I Wrong About Her starts with Hayato remembering the day he and his childhood friend Haruki were separated. They promised to remain pals even after moving apart, but years have passed. Now, after moving to Tokyo with his family, Hayato begins at a new school with no idea that his past is about to return.
At school, Hayato introduces himself as someone from Tsukinose, a rural area where monkeys, deer, boars, chickens, and goats are common sights. His classmates are fascinated by his country upbringing, especially after learning that he barely had anyone his age around him. Hayato explains that he had only one close friend, Haruki, and remembers their wild childhood adventures, including jumping from a bridge into a river and climbing trees they could barely get back down from.
He is seated beside Nikaido-san, and the name immediately reminds him of his old friend. Hayato jokes that Haruki would probably use their shared surname to flirt, but Nikaido soon feels strangely familiar. When Hayato describes Haruki as something like an angry monkey, Nikaido reacts with obvious irritation.
Hayato cannot understand why she seems so hostile. Another student, Mori Iori, explains that Nikaido is one of the most admired girls at school. She is attractive, kind, intelligent, and popular with the sports teams, yet she has never apparently fallen for anyone. Hayato is even more confused because the girl everyone praises seems completely different from the Haruki he remembers.
During lunch, Hayato looks for somewhere quiet and wanders into the school garden. There he meets Mitake-san, a gardening club member. Hayato quickly recognizes the vegetables she is growing and explains that the zucchini needs pollination, while the eggplant and shishito peppers need pruning. His knowledge comes from helping on fields back in the countryside.
Nikaido arrives, and her reaction makes Hayato even more suspicious. Later, when classmates invite Hayato to karaoke as a welcome party, Nikaido suddenly stops him. She claims Hayato had already asked her to show him around campus and pulls him away. That is when the mystery finally breaks open.
Nikaido leads Hayato to a secluded storage room she calls her secret base. Once they are alone, Hayato realizes the truth: Nikaido is actually Haruki, his childhood friend. The person he thought he had lost has been attending school under a completely different appearance. Her camouflage is meant to keep her circumstances hidden.
Their reunion immediately slips back into their old rhythm. They tease each other, argue over the favors they owe one another, and remember how competitive they were as children. Haruki admits she has been through a lot, while Hayato still cannot resist joking about her disguise. Their friendship is clearly intact despite the years apart.
The two revive another childhood habit by challenging each other to a best-of-five contest, with the loser owing the winner a favor. The episode also reveals that Haruki’s family situation is complicated, with her father visiting her mother at the hospital. Haruki clearly has personal reasons for keeping her situation hidden.
At home, Himeko notices that Hayato is unusually happy. He tells her that he ran into Haruki at school and that they even sit beside each other. Himeko is delighted. Hayato jokes that Haruki has become even stronger and pushier, comparing her evolution from a monkey to a gorilla, but underneath the joke he is simply relieved to have her back.
The next morning, Hayato helps Mitake in the garden. He offers to handle the pollination with a cotton swab, but an innocent discussion about stamens, pistils, and reproduction suddenly sounds embarrassing to Mitake. She turns bright red, leaving Hayato confused.
Then Nikaido appears and sees the awkward scene. She immediately wonders what Hayato is doing to Mitake, forcing him into another embarrassing explanation. Haruki later admits she had been watching nearby and deliberately waited before stepping in because she wanted to protect her reputation at school. Hayato is annoyed that his friend let him take the blame, but their argument shows how naturally they have returned to their old dynamic.
Haruki’s behavior now makes sense. She is not rejecting Hayato; she is protecting the identity she has created at school and does not want their relationship to expose her secret. Hayato decides to give her some space in public and let her explain things when she is ready.
Soon afterward, Nikaido privately takes Hayato back to her secret base to discuss something personal. Haruki admits that she has always dreamed of eating lunch with friends. She avoids doing so because she believes someone else would become jealous if they saw her eating with another person. The secret room gives her a place where she can finally enjoy that simple experience.
Hayato offers to meet her there for lunch whenever neither of them has anything else going on. Haruki is genuinely moved, and the two turn the idea into a promise. For Hayato, this is more than arranging a place to eat. It means keeping alive the connection they made as children.
The episode closes by reflecting on how much time has changed them. Hayato is now taller, their hands feel different when they hold them, and even their running pace has changed. Yet he is confident those differences cannot erase their bond.
As they part, Hayato tells Haruki, “Welcome back.” She questions the wording, but he explains that, as far as he is concerned, she has returned. The final exchange gives the episode its emotional payoff: the relationship Hayato believed had ended has finally found its way back into their everyday lives.
Oh Boy Was I Wrong About Her Episode 5 is a fun and surprisingly heartfelt chapter that balances comedy, friendship, and a touching reunion. Hayato’s discovery that the seemingly distant Nikaido is actually his childhood friend Haruki gives the episode its strongest emotional moment, while their playful arguments capture the easy chemistry they shared as children. The school garden scenes with Mitake add another layer of humor, especially as Hayato’s innocent countryside knowledge creates awkward misunderstandings. Haruki’s secret circumstances also give the story a more personal edge, showing why she keeps her true connection with Hayato hidden at school. The final “Welcome back” exchange is especially effective, turning a simple reunion into a meaningful reminder that their childhood bond has survived years apart. Overall, Episode 5 delivers a strong mix of laughs, character development, and emotional warmth while setting up an interesting new dynamic between Hayato and Haruki.
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