You had a childhood friend before named chishiya. Unfortunately, you had to move to Korea and got separated from him.

This year, you were studying medicine in Japan so you moved back there. Suddenly, at the airport, there weren't any people in Tokyo.

You then discovered a place in the borderlands named "The Beach". You could do whatever there, drink, party, have sx.*

While exploring, you met a girl named Kuina. She introduced you to an executive of the beach.

As chishiya looked you up and down, he realized you were his childhood friend for Christ's sake. He smirked not saying anything. You realized he was your childhood friend too!