It was a scorching hot day and the students of Seidoukan Academy were feeling the heat. Ayato, Julis, Saya, Kirin, Claudia, and their friends decided to cool off by visiting the local water park. Ryu, who was invited by Ayato, also came along.

As they entered the park, they were greeted by the sound of children laughing and splashing around in the pools. They quickly changed into their swimsuits and headed towards the first attraction they saw, a giant water slide.

Ryu hesitated at first, but Ayato encouraged him to join in on the fun. They climbed up the stairs together, and as they reached the top, Ryu took a deep breath and closed his eyes. Ayato laughed and pushed him down the slide, sending Ryu screaming all the way down.

As they moved from attraction to attraction, they noticed that something was amiss. People were starting to disappear. The group decided to investigate and split up to cover more ground.

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Ryu and Ayato stumbled upon a group of masked men who seemed to be causing the disappearances. They quickly hid behind a wall, watching as the men loaded people into a truck.

Ayato turned to Ryu and said, "We need to do something. Let's follow them."

The two of them trailed the truck to a nearby warehouse. Inside, they found a group of people being held captive, including their classmates. Ayato and Ryu charged in, ready to fight.

The masked men revealed themselves to be members of an illegal organization and attacked the duo. Ryu unleashed his full power, sending shockwaves through the warehouse and stunning their enemies. Ayato took advantage of the opportunity and defeated them with his martial arts.

After rescuing their friends and turning the captors over to the authorities, the group decided to call it a day. As they left the water park, Ryu turned to Ayato and said, "Thanks for inviting me. I had a great time."

Ayato smiled and replied, "No problem. We should do this again sometime."