With the help of Kamen Riders Wizard, Gaim and Drive, Dr. Pacman and the Next Genome Institute were obliterated by Kamen Riders Ghost and Ex-Aid. After that, we see the 5 Riders doing a fist bump before going on their separate ways. It's been a few weeks since the Dr. Pacman incident happened and while Ex-Aid is still performing his duty as a Kamen Rider, Ghost and 3 other Riders are going back to their normal lives, knowing that Ex-Aid is the current protector of Earth.

Somewhere in the road, we see Haruto Soma sitting on his Machinewinger, eating his usual plain sugar donuts as he observed the road. After eating his donut, he then mounts into his bike and drive off the road. While driving, he begins to think what his friends are doing.

"Shunpei...Rinko...I hope we'll meet each other again..." Haruto muttered. "Well, better not think about them right now, I still had this journey up ahead."

As he was crossing the road, he noticed a mysterious portal up ahead.

"A portal?" Haruto was confused as to why a portal suddenly appeared.

He tried to stop his bike as to prevent him from being sucked into the portal. However, it was too late as he was already entering the portal before he could stop it entirely. The portal disappears afterwards.

In a mysterious planet, we see Mai Takatsukasa as the Woman of Beginning taking care of the flowers. She turned around to see Kouta returning from his long trip to Earth.

"Kouta!" Mai called out.

"Mai! Sorry to keep you waiting." Kouta told her.

"So, how's your trip to Earth?" Mai asked.

"It went pretty well, I guess. I even get to meet up with Wizard and Drive again." Kouta explained what happened.

"I see..." Mai said as he looked down.

"Don't worry, Mai. Ex-Aid is currently the protector of Earth now. I'm sure he'll get the job done while we're here." Kouta reassures her.

"Really?" Mai asked.

"Yeah. Right now, we must focus on taking care of this planet." Kouta said.

"You're right..." Mai said.

The two began to walk towards the field of flowers.

"So, I've heard that you've helped the other Riders." Mai informed.

"Yeah. It was very fun, meeting up with old and new Riders. We even defeated Dr. Pacman and the Next Genome Institute." Kouta told her.

"Have you seen Micchy and the others?" Mai asked.

"They're doing pretty fine, Mai. You don't have to worry about them." Kouta reassured Mai.

"How would you know?" Mai asked.

"Well, let's just say that I saw Micchy and his brother hanging out outside the cafe." Kouta answered.

"Oh. I guess those two finally get along." Mai commented.

"They're brothers, after all." Kouta told her.

"You're right..." Mai said.

"So, how were things here while I was in Earth?" Kouta asked.

"This planet is doing pretty fine even without your presence. In fact, I even planted more flowers over there." Mai said as she points to another flower field.

"Wow, nice job, Mai." Kouta said.

"Thanks, Kouta. This planet should be peaceful in no time." Mai replied back.

However, their conversation was interrupted when a mysterious portal appeared in front of them.

"What's a portal doing in here?" Mai asked.

"I don't know, but I had a bad feeling about this..." Kouta answered.

The portal starts to suck up Kouta. Mai holds Kouta's arm as to prevent him from sucking into the portal.

"Kouta!" Mai shouted.

She tried her best to keep Kouta from the portal. But the wind was too strong and Kouta was eventually sucked into the portal. After the portal disappears, Mai kneels down in sadness now that Kouta is gone somewhere...

Outside the police station in Earth, we see Shinnosuke Tomari exiting the building. He was done with his shift as a police officer. As he goes to the road, he was surprised to see the Tridoron parked in the road, waiting for him.

"I've been waiting for you, Shinnosuke." Mr. Belt asked.

"Mr. Belt." Shinnosuke said with a smile.

He eventually got on the Tridoron and starts driving on the road.

"You know, it's good to have you back, Mr. Belt." Shinnosuke told him.

"Yes. It's been a while since we last met..." Mr. Belt said.

"So, how did you came back, anyway? I thought you put yourself and the Drive Pit into lockdown." Shinnosuke asked about his reappearance.

"Well, let's just say that someone reactivated the Drive Pit, thus allowing myself to aid you once again..." Mr. Belt explained.

"It was him, wasn't it?" Shinnosuke chuckled, referring to Kouta.

"Correct. He somehow managed to make it into the Drive Pit and grab me, thus leading me to you in your battle against the Next Genome Institute." Mr. Belt answered.

"As expected from God himself..." Shinnosuke said.

"By the way, how is Kiriko doing?" Mr. Belt asked.

"Oh, she's doing pretty well. We managed to find ourselves a home after our marriage." Shinnosuke explained.

"I've heard that she's pregnant." Mr. Belt said.

"Yeah. But we don't know yet if it's a boy or girl..." Shinnosuke responded.

"Well, in any case, congratulations!" Mr. Belt greeted him.

"Thanks. I couldn't have done it without you." Shinnosuke happily said.

"Glad I could help you, Shinnosuke." Mr. Belt responded.

While driving through the road, Shinnosuke noticed a portal ahead of their location.

"Hey, Mr. Belt. There's a portal straight ahead!" Shinnosuke informed.

"What?!" Mr. Belt looked around to see a portal ahead.

"What should we do?" Shinnosuke asked.

"Stop the car!" Mr. Belt ordered.

Shinnosuke didn't hesitate to step on the brake to stop Tridoron. It eventually stopped with the portal nearby.

"Whew! That was close!" Shinnosuke said.

"In any case, we should avoid it at any cost!" Mr. Belt told him.

"Right!" Shinnosuke said.

But before he could backpedal, the Tridoron suddenly move forward on it's own.

"What's going on?" Shinnosuke was shocked.

"The portal! It's trying to suck us in!" Mr. Belt informed.

They tried to escape, but it was too late as they were sucked in the portal.

Meanwhile, we see Takeru Tenkuuji exiting a classroom. It seems that the class was already finished as he heads towards the exit of the school.

"Whew, another day of school over...and I still didn't make any friends. I'm hoping tomorrow would change that..." Takeru said to himself. "Oh well, time to head back to Daitenkuu Temple."

He gets on the Machine Ghostriker and rides off on the road.

"We've been waiting for you, Takeru." Akari said.

"So, how was your class?" Onari asked.

"It's pretty okay, actually." Takeru responded.

"Have you met any new friends?" Onari asked.

"Well, it didn't go pretty well..." Takeru said.

"No one's gonna be friends with you?" Akari asked.

"It's not that. It's just that they find me weird." Takeru described what happened.

"How dare they say that to you! Unforgivable!" Onari shouted.

"Don't worry, Takeru. I'm sure you'll make new friends eventually." Akari reassured him.

"You really think so?" Takeru asked.

"Yeah. Trust me, I've been through the same thing." Akari answered.

"Thank you, Akari." Takeru said.

"No problem. Let's go inside. The old man is waiting for you." Akari told him.

"So, how were Makoto and Alain doing?" Takeru asked Akari.

"Well, after the incident, they told me that they're gonna return to the Ganma World. I've heard that they're running a takoyaki stand in there." Akari explained.

"I guess he really missed Grandma Fumi so much." Takeru chuckled.

"Yeah..." Akari added.

Together, they walked towards the stairs. However, a portal suddenly appears in front of the temple.

"What the? A portal?" Akari wondered.

"Is it from them?" Onari asked.

"No, I don't think so. This looks nothing like the Ganma Portal." Takeru responded.

"Then, what's it doing in here?" Onari asked.

"I don't know, but it's best we avoid it. Who knows where this portal will took us?" Akari suggested.

Just as they were about to avoid the portal, it suddenly starts sucking up Takeru.

"Oh, no! Takeru!" Akari reaches for his arm.

"I got you, Takeru-dono!" Onari reaches for his other arm.

Together, they tried to pull Takeru away from the portal. However, the wind was too strong and it eventually sucked him in. The portal disappears.

"Takeru..." Onari was saddened.

"No way..." Akari was saddened as well.

They kneel down in sadness as their friend was taken away from them by the portal. Then, the Sennin came out of the temple and wondered what's going on.

"Oh? What happened here?" The Sennin asked.

"Takeru got sucked into a portal!" Onari informed.

"Hmm...So it has begun..." The Sennin said.

"W-What are you talking about?" Akari asked.

"There's a prophecy where the Legend Riders would come to a world full of devastating monsters in order to save it from an unknown group of villains with malicious plans." The Sennin informed.

"You mean Takeru is one of those Legend Riders?" Onari asked.

"That's right. Takeru is one of the Legend Riders who is destined to save the world." Sennin answered.

"So, that portal basically took him to another world..." Akari said.

"Now, I know that you're all worried about him, but I assure you, he's going to be fine. In fact, he's going to be accompanied by his fellow Legend Riders." Sennin assured them.

"You're right..." Akari said.

"Let's go inside. I will tell you more about the world Takeru is in." Sennin told them.

With that, Akari, Onari and the Sennin all went inside the Daitenkuu Temple.