The story begins at "Diamondhead", which is a resort for tourists right by the ocean. Izumi Makoto(Hirosue Ryoko) is in her second year as a senior high school student, and lives with her grandfather, Izumi Masaru(Mike Maki).
Suzuki Kaito (Takenouchi Yutaka) is a frustrated salaryman in Tokyo, who is tired of his hectic job. When his project gets rejected at work one day, he decides to take a long trip away from Tokyo, and get away from all the stress. He wanted to go somewhere far, where he could totally forget about everything. He took the train, heading towards the sea.
Sakurai Hiromi (Sorimachi Takashi) has no job whatsoever and just wanted to take a trip somewhere. Since he was fond of the ocean and swimming, he was heading in the same direction as Kaito. But Hiromi's car broke down and he had to push the car by himself. Kaito noticed Hiromi from the train, and got off at the station to help push the car. Kaito has a calm composure, is very polite, and quiet. On the other hand, Hiromi was very hyper, no manners, and carefree.
That afternoon, the two made their way to Diamondhead. But since the road went downhill, the car started moving on its own and the two ended up falling in the ocean. Hiromi thought it was fun, but Kaito was upset. Hiromi came to Diamondhead in order to work, since he had no job and was thrown out by his girlfriend. On the other hand, Kaito just came as a guest.
While trying to explain that he was only a guest, Kaito found out that his wallet was missing. He thought that he had probably dropped it in the ocean. So it turns out that Kaito and Hiromi had to stay in the same room together. But even though the two had totally different characters, Makoto thought that they were a good combination.
After having a drink at the bar, Nagisa, where Haruko worked at, Hiromi found out that some youngsters who were also staying at Diamondhead, had found the wallet in the ocean and were attempting to spend the money. Hiromi managed to get the wallet back, and returned it to Kaito. The day before, Kaito called his girlfriend Sakura in Tokyo, to send him some money since he had lost his wallet. Therefore, he was able to move to the guest room. Kaito thought this was a way to get away from Hiromi, but Hiromi, nevertheless, would still bother Kaito.
One day, Masaru gets a letter from Makoto's mother, Keiko. Keiko wanted Makoto to live with her in Tokyo. It was a hard decision for Masaru to make, since Makoto loved Diamondhead, but he thought that this was the best thing to do. This also meant that he had to shut down Diamondhead. So after making this decision, he had to throw out Kaito and Hiromi. So Kaito reluctantly goes back to Tokyo for awhile, and Hiromi just hung around the area, also fond of the place.
After a few days passed, Kaito and Hiromi both decided to go back to Diamondhead, because they were unable to forget about it. Kaito gave his watch to Sakura before he left, asking her to hold onto it for him. He got this idea from Hiromi, meaning that he wasn't ready to go back to work yet, and his vacation wasn't over. Makoto was very happy, since they were the "Beach Boys", in her view.
- End of Episode One -