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Kokoro, a first year high school student, meets her mother's new husband. Then, her senior from middle school shows up... The story begins when Kokoro and her senior, who was the son of her mother's new husband, become step-siblings.
- Author and artist
- Yuuko Kasumi
- Publisher
- Shueisha
- Alternative names
- Hajimete no Onii-chan
- はじめてのおにいちゃん
- My First Big Brother
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