Arisu was asking people for information about the Beach, but he had no leads at all. His visa was set to expire in just three days. He followed Yuzuha to go hunting, hoping to learn more hunting skills. Soon, it was night, and game time arrived. Yuzuha and Arisu spotted members of the Beach and decided to observe them first before following them to the Beach. The Beach members won the game and drove away in an old car. Arisu and Yuzuha chased after the car, running desperately, and eventually, they indeed found the Beach. Suddenly, Yuzuha was caught in a sack, and Arisu was knocked out.
When Arisu and Yuzuha saw light again, they were tied to chairs. At this moment, they encountered Danma Hikaru, the founder of the Beach. Danma told Arisu that collecting all the playing cards would allow one person to return to the original world. For this reason, Danma established the Beach, using fuel to generate electricity, collecting rainwater, and even gathering weapons.
Danma informed Arisu of the Beach’s three rules: everyone must wear swimwear at the Beach, as this prevents hiding weapons; all playing cards are to be kept by the Beach, and those who contribute to collecting the cards can rise in rank, with priority for returning to the original world determined by rank; finally, betraying the Beach would result in execution.
Since Arisu had the Seven of Hearts, a card the Beach did not possess, Danma invited both Arisu and Yuzuha to join the Beach. After joining, they changed into swimwear and went to the poolside. In the distance, two women looked at them with strange gazes. As night fell, it was time to participate in the games again. Danma received fervent admiration from the Beach members, who gathered in the hall to cheer for him. In a corner, Kyūya Shuntarō looked at Arisu and Yuzuha and said to Mizuki beside him, "They might be useful to us." It seemed they were plotting something. Based on their numbered tags, Arisu and Yuzuha boarded corresponding cars to participate in games at different venues.
The games seemed easier in front of the Beach members. Kuni, Nira, and Samura Ryōin all made appearances. Yuzuha participated in the Matchstick Factory Bingo game, where she had to use only nine matchsticks to find numbers hidden in 24 rooms and answer correctly to achieve bingo and clear the game. Arisu joined Anzu Tsukasa in a game, as Anzu wanted to test whether Arisu had the potential to become a Beach executive. The game had seven participants and was called "Lightbulb," with a difficulty level of Four of Diamonds.
The rules were as follows: Rule 1: There are three switches in the room—A, B, and C—but only one can turn on the lightbulb. Rule 2: While the door is open, players have only one chance to flip a switch. If the door is closed, there is no limit to the number of times switches can be flipped. Rule 3: If someone is in the small room or if a switch is flipped to the "on" position, the door will lock and cannot be opened. The group has only one chance to answer, and they must choose the correct switch that controls the lightbulb to clear the game. If the water level rises and touches the wires, the game ends.
The game began, and Anzu, looking confident, tasked Arisu with solving the puzzle. After analyzing the situation, Arisu successfully cleared the game, earning Anzu’s approval. Meanwhile, Yuzuha also cleared her game, and the two reunited at the poolside.
Kuni, Nira, and Samura Ryōin, members of the militant faction, appeared at the poolside. Kuni approached, having taken a liking to Yuzuha, and attempted to claim her for himself. Arisu tried his best to stop him, but he was no match for Kuni alone. As the leader of the Beach’s militant faction, no one dared to challenge Kuni. Just then, Danma stepped in and stopped Kuni. Reluctantly, Kuni gave up on Yuzuha. The militant faction, led by Kuni, and the idealist faction, led by Danma, had irreconcilable conflicts. For now, Danma was still the nominal leader of the Beach, and even Kuni had to obey him. Danma called a meeting of the Beach executives, and due to Arisu’s performance, he was also invited. Arisu had clearly become an executive of the Beach.
In the meeting room, the Beach executives looked at the wall covered with playing cards. Aside from the face cards, only the Ten of Hearts was missing. Danma’s visa was about to expire, which meant he would have to participate in the next game. After the meeting, Danma spoke with Arisu privately. From Danma, Arisu learned that Danma had originally been a host, running a host club. That club was called the Beach, and he had wanted everyone to live with dignity. However, one of his hosts had collapsed and committed suicide, and eventually, everyone else left him. This tormented him and forced him to mature quickly. After arriving in this world, he established the Beach, gathering everyone to serve his purposes. Danma’s ambition was to return to the original world.