Tsukasa was on vacation and collected seashells, of which there were a lot.

"hahaha! Saki will be happy with the beautiful shells I will bring her!" he said with his enthusiasm and suddenly took a very large shell in his hand.

and then he remembered that he could hear the sea in the shells. he put it to his ear and heard the wonderful sounds of the waves that were on the shore.

"hello? is someone here?" he said jokingly but he didn't know that someone would actually answer him soon.