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After the death of their mother, Nao helped raise his two younger twin brothers. Although they've outgrown Nao in size, their big brother complex causes them to cling to Nao incessantly.
- Author and artist
- Kei Kanai
- Publisher
- DMG, Taiyo Tosho
- Alternative names
- Boku wa Oniichan.
- 僕はお兄ちゃん。
- Boku wa Onii-chan
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