Aiba’s birthday present to him.
When asked if he has worn the hat before, Sho said no. XD
PS: Was multitasking at work so I wasn’t paying close attention but I think I heard him saying that Sho ran out of ideas on what to show on Hanamaru. Then he saw Aiba’s birthday present and decided to show that on TV. Apparently he told Aiba about showing in on Hanamaru and Aiba was happy about it.
I wonder if Sho sings TABOO to Aiba privately ;D