Sugisaki was happy. After graduating high school, he felt sad about leaving his harem. But, he promised himself that he was going to keep track of them. He wouldn't stop until he'd captured their hearts.
And he did. He continued to pursue them all until they agreed.
They all moved to a country were they approve polygamy and married.
He had children with each of them and they all lived happily ever after.
Shut up idiot.