Boku wa Oniichan.
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.(Source: shinkeikaku)
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I'm The Big Brother has 7 chapters across 1 volume.
As of now, I'm The Big Brother has finished.
I'm The Big Brother is a manga, originally from Japan.