Happy Birthday Yukarin

Maybe I was destined to become a permanent employee of the King of Hell in this life, and then spend the rest of my life happily with beautiful women. However, I was transported to another world because I mistakenly touched a button.
When I arrived in this world, in front of my eyes were two women who were changing their clothes and stroking each other's bodies. Because of my arrival, their movements suddenly stopped ......
"Peeping Tom!" What kind of anticlimactic opening is this?
Future technology? Time travelers? The Mobile Unit? An amusement park on the verge of bankruptcy? What kind of nonsense is this?
Let's rebuild the amusement park with Keon, a genius girl, and Dee, a secretarial girls in professional attire!! Find a way to get back.
Wait a minute. Why am I working at an amusement park when I'm in another world?

After being falsely accused and ordered to drop out of school, you are forced to hide in a dark room and live your life. You thought your life could not get any worse, but you fell into a scam of online nude chatting and got caught in the middle of a fight between the gangs and the WSA.
You are not only arrested and imprisoned by the WSA, you are even sentenced to death. You have to either be the dog of a young lady or the hostage of a ruthless killer to have a chance of survival.
You will make your own choice between the daughter of the head of the WSA and the daughter of a gangster.
Modern technology versus the slums, the WSA versus the gangs, third-party mysterious forces, and strange alien creatures - all of these conflicts are shrouded in an impenetrable fog that will shatter your past life. Start over, solve all the mysteries, and become the hero of the city.

When Dr.Ben Johnson and his wife Dr.Claire heard about the mysterious Moonflower and its amazing healing properties, they wasted no time heading to an island in the middle of the Pacific to hunt for the fabled plant.

What they didn’t expect to find there was the Aimumu, an ancestral tribe who had been watching over the island for centuries and guarded the secrets of the Moonflower from the hands of outsiders. To complete his ambitious research and make a name for himself in the halls of science, Dr Ben will need to earn the tribe’s trust.

Once, an old carpenter made a wish on the shooting star, making his puppet come to life; Li Yuan made a wish on the shooting star, making his sex doll come to life. And when he woke up and saw the doll, with his "stuff" still in her body after sex last night, opening her big eyes and talking to him, the first thought that...

Toono Yuu, a Kazami Academy sophomore, eschews typical teen life for work――

"Youth? No time. I've got jobs."

Yuu's all about practicality, choosing part-time jobs over typical teenage fun. He manages his studies well and spends most of his time working for money. His childhood friend Hibiki and classmate Riri, who looks up to Yu, think he needs a change. They each try to get him to join a club.

Hibiki champions the "Action Club," nicknamed "Acti-Club"―― lively girls promoting "more youthful fun at school!"
Riri advocates the "Volunteer Club," nicknamed "Negati-Club"―― serious girls dedicated to "using youth to better the world."

Both relentlessly recruit Yuu――

"Not interested. Don't need youth."

Yet Yuu finds himself drawn into their world, despite his protests――
His predictable routine gives way to unexpected experiences.
How did this happen?

"Isn't it obvious?" his peers suggest.
"Brace yourself, senpai. Time to embrace your youth!"

What adventures await this reluctant teen!?