Tamaki refusing to see everyone including his mother, and all he does is playing piano. Everyone's caring about Tamaki.
The piece he played is recognized by his grandma and their common interest is born!
His father told him what his grandma liked.
Haruhi, who heard what president said, learned that he cared for his mother, too, but couldn't express it. They just need to talk.
She learned that Tamaki's mother is having a short stay and leaving next day without meeting Tamaki. Hunny-senpai and Mori-senpai is going to do something on Tamaki part.
Kyouya agreed to help as well and amazed at how reckless (like Tamaki) is Haruhi.
So they are going to bring Tamaki to airport before his mother leaves.