Story
After leaving a scar on his best friend's face years ago, Tsubaki feels responsible and is determined to grow up big and strong so he can protect Yuu. Yuu is already in high school and Tsubaki is only in elementary, but he is sure that his feelings will get through and Yuu will eventually come to rely on him.
Synopsis via AniList (English).
Preview
From the anime adaptation: Ore to Yuu-nii!.
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