Onii-chan ni Natchatta
おにいちゃんになっちゃった
A little boy watches as all the women around him fuss over a baby. He cannot understand why they pay so much attention to something that only cries and makes noise, unable to do any tricks. The baby seems to take all the focus away from him, leaving him confused and a little jealous.
Everything changes when someone calls him "Oniichan" for the first time. The boy suddenly realizes that being a big brother comes with a special status. He begins to see the baby in a new light, understanding the importance and pride that comes with the title.