ONA
Description
Onii-san, also known as the Salaryman, is the main male character of Tawawa on Monday. He is a young office worker employed in sales at an unnamed company, and his real name is never revealed; the series refers to him only as Onii-san, a term meaning older brother, or by his occupation. He is tall and solidly built, with an athletic frame, and is almost always seen wearing a business suit.
His story begins with an accidental encounter on a crowded Monday morning train. Pressed against a high school girl named Ai-chan, he worries that he might be mistaken for a groper and tries to leave the situation by offering his business card, a precaution he once learned about. The attempt goes wrong when he drops his card case and Ai-chan retrieves it, and the embarrassment of the moment leads to a chain of events in which she accidentally injures him. She accompanies him to the hospital, where he is found to be only lightly injured. When he asks her name, she gives the obviously invented name Ai-chan, but the two settle into an arrangement: she will help monitor his recovery, and he will act as her bodyguard on the crowded Monday morning commutes she must make for school committee duties. From that point, they meet on the station platform every Monday.
In personality, Onii-san is sincere, patient, and dependable. He is reserved and initially keeps his private life to himself, but he gradually opens up to Ai-chan as their weekly conversations continue. He carries himself with strong self-restraint, responding to Ai-chan's playful and forward behavior with composure and a sense of propriety, and he is mindful of her reputation as much as her physical safety. He is also a diligent worker who takes his job seriously, even though the return to the office each week weighs on him.
His motivations are rooted in both responsibility and comfort. He agrees to the arrangement out of a sense of obligation after the accident, but the role quickly becomes meaningful to him. Protecting Ai-chan gives his weekly routine purpose, and her company becomes the bright spot that helps him endure a job he finds draining. He treats their meetings as a kind of good-luck charm that carries him through the working week until the next Monday.
Within the story, Onii-san serves as the central male presence and the anchor of Ai-chan's episodes, framed as an ordinary working man whose Mondays are changed by an unexpected meeting. He also connects to the wider cast. At his company he works alongside Senpai and under a section manager, and in the serialized manga version he is revealed to be the cousin of the volleyball club member known as Volley-bu-chan, whom he taught volleyball when they were younger.
His closest relationship is with Ai-chan. What begins as an awkward accident develops into trust, warmth, and eventually romance as the series progresses. She gives him a button from her clothing as a protective charm, a gesture that becomes a recurring symbol of their bond, and he treasures these keepsakes as the motivation that gets him through the week. With Volley-bu-chan, he shares an easy family connection, and with his colleagues he maintains a professional but friendly rapport.
Over the course of the story, Onii-san develops from a nameless, weary commuter into a more open and emotionally invested person. The Monday mornings he once dreaded become the highlight of his week, and his growing attachment to Ai-chan softens his reserved exterior. His development is shown mainly through the deepening of that relationship, as a protective arrangement matures into genuine affection.
Onii-san has no supernatural talents; his notable abilities are physical and moral. His height, sturdy build, and background in volleyball give him the strength to shield Ai-chan from the pressure of crowded trains and to act as a barrier against gropers. His self-discipline keeps the arrangement proper and respectful, and his reliability, appearing every Monday without fail, is presented as his defining strength.
His story begins with an accidental encounter on a crowded Monday morning train. Pressed against a high school girl named Ai-chan, he worries that he might be mistaken for a groper and tries to leave the situation by offering his business card, a precaution he once learned about. The attempt goes wrong when he drops his card case and Ai-chan retrieves it, and the embarrassment of the moment leads to a chain of events in which she accidentally injures him. She accompanies him to the hospital, where he is found to be only lightly injured. When he asks her name, she gives the obviously invented name Ai-chan, but the two settle into an arrangement: she will help monitor his recovery, and he will act as her bodyguard on the crowded Monday morning commutes she must make for school committee duties. From that point, they meet on the station platform every Monday.
In personality, Onii-san is sincere, patient, and dependable. He is reserved and initially keeps his private life to himself, but he gradually opens up to Ai-chan as their weekly conversations continue. He carries himself with strong self-restraint, responding to Ai-chan's playful and forward behavior with composure and a sense of propriety, and he is mindful of her reputation as much as her physical safety. He is also a diligent worker who takes his job seriously, even though the return to the office each week weighs on him.
His motivations are rooted in both responsibility and comfort. He agrees to the arrangement out of a sense of obligation after the accident, but the role quickly becomes meaningful to him. Protecting Ai-chan gives his weekly routine purpose, and her company becomes the bright spot that helps him endure a job he finds draining. He treats their meetings as a kind of good-luck charm that carries him through the working week until the next Monday.
Within the story, Onii-san serves as the central male presence and the anchor of Ai-chan's episodes, framed as an ordinary working man whose Mondays are changed by an unexpected meeting. He also connects to the wider cast. At his company he works alongside Senpai and under a section manager, and in the serialized manga version he is revealed to be the cousin of the volleyball club member known as Volley-bu-chan, whom he taught volleyball when they were younger.
His closest relationship is with Ai-chan. What begins as an awkward accident develops into trust, warmth, and eventually romance as the series progresses. She gives him a button from her clothing as a protective charm, a gesture that becomes a recurring symbol of their bond, and he treasures these keepsakes as the motivation that gets him through the week. With Volley-bu-chan, he shares an easy family connection, and with his colleagues he maintains a professional but friendly rapport.
Over the course of the story, Onii-san develops from a nameless, weary commuter into a more open and emotionally invested person. The Monday mornings he once dreaded become the highlight of his week, and his growing attachment to Ai-chan softens his reserved exterior. His development is shown mainly through the deepening of that relationship, as a protective arrangement matures into genuine affection.
Onii-san has no supernatural talents; his notable abilities are physical and moral. His height, sturdy build, and background in volleyball give him the strength to shield Ai-chan from the pressure of crowded trains and to act as a barrier against gropers. His self-discipline keeps the arrangement proper and respectful, and his reliability, appearing every Monday without fail, is presented as his defining strength.