Old Kai narrowed his eyes. "Where is this? Who are you?"

Yu Qian'an introduced: "We are warriors who have gathered to fight against Majin Buu. We are here to find a way to defeat Majin Buu."

Xin looked at the old man in front of him in shock: "Who are you? Why are you wearing a Kaioshin costume?"

Old Kai: "I am the Kai from the fifteenth generation ago. Back then, I had a quarrel with the God of Destruction Beerus and was sealed in this sword by him. Little kid, what year is it now? Are you the current Kai? Why do you look so young and unreliable?"

Xin blushed, "I'm sorry, Senior. Due to Majin Buu's rampage, the Grand Kai led the other three Kais to fight against Majin Buu but failed, leaving me alone. I haven't received any systematic training, so I don't know how to be a qualified Kai. I'm really sorry."

Old Kai: "Majin Buu? What the hell is that?"

Xin: "Majin Buu is a demon created by Bibidi. He..."

After listening to this, Old Kai shook his head and said, "Majin Buu was not created by Bibidi, but has existed since ancient times. He is a creature that has survived repeated rampages and long periods of dormancy. In this process, he has absorbed the evil elements of humans and has become increasingly ferocious.

The Bibidi you mentioned only knew how to awaken him from his long hibernation. Buu, having undergone a transformation when Evil Buu left, has become a slightly different form, so it's unknown whether he'll also enter a long hibernation period.

Buu has infinite regenerative ability and can regenerate as long as one cell is not destroyed; he can also absorb others and become part of his body.

He's a really troublesome guy."

Xin: "Ah? I see! Then do you have any way to destroy him?"

Old Kai: "No, but I see a lot of potential in this group of people. If they are developed, defeating Majin Buu won't be a problem."

Yu Qian'an immediately said, "Then, Old Kai, shall we start with me?"

Old Kai looked at Yu Qian'an, then at Son Gohan: "But I think he has greater potential."

Yu Qian'an grabbed the old Kai and said, "Your Excellency Kai, to show my sincerity, I will take you to a place."

Yu Qian'an used teleportation to put invisibility talismans on Old Kai and himself, and took Old Kai to a bathhouse and changing room for female workers in Kabukicho, and then went to a large izakaya and did the same thing again.

It wasn't until Old Kai's nose bled that Yu Qian'an brought him back to the Kaishin Realm: "Old Kai, do you feel my sincerity? I really want to improve my strength!"

Old Kai nodded and wiped the blood from his nose: "I feel it, you are the most sincere. All of them put together are not as sincere as you. Let's start with you, no one else can do it!"

Xin looked at Yu Qian'an dissatisfiedly: "How dare you threaten and beat up Old Kai! You've gone too far..."

Yu Qian'an: "Don't talk nonsense. I just took Old Kai to experience the beauty and kindness of the human world. If such a good human being is not saved, wouldn't it be a pity?"

Old Kai nodded. "Yes, he is indeed a generous and wealthy human being. He also knows a lot of skills... knowledge! He must be saved. It would be a shame not to save him. Come quickly and let me improve your strength. However, after your strength is improved, I still want to continue to visit those generous and kind humans!"

Yu Qian'an: "No problem, I'll give you a diamond VIP membership, and you can live here from now on!"

Old Kai asked Yu Qian'an to sit down and then began the ceremony to enhance his potential.

Yang Jiarui rolled his eyes and thought, no wonder they built such a large Kabukicho izakaya and designed a special changing room and hot spring for female employees, and prohibited wearing clothes while taking the hot spring bath. It turned out that it was prepared for this old pervert.

It has to be said that Yu Qian'an's tactics were very effective, and he successfully became the first person to improve his potential.

Yu Qian'an was not like Son Gohan who was improving with doubts all the way and did not gain any benefits except the final energy.

Yu Qian'an closed his six senses and looked inward carefully, feeling every change in his body, absorbing the power from Old Kai and strengthening his entire body inside and out.

When this force touched the energy in Yu Qian'an's body, it was like ice and snow touching fire. It quickly melted into water, freeing up space, strengthening the energy, and at the same time expelling impurities from the body.

In just one day, Yu Qian'an felt that he had broken through the boundary between hundreds of billions and trillions. Now, relying solely on his physical strength, Yu Qian'an was able to compete with Mahayana masters.

After all the development was completed, Yu Qian'an felt that his strength had reached the scale of 3 trillion.

Yu Qian'an opened his eyes and found a lot of people looking at Yu Qian'an and Old Kai as if they were fools.

Yu Qian'an turned around and saw that Old Kai had fallen asleep while developing his potential!

Yu Qian'an woke him up: "Old Kai, please help this lady develop her potential!"

Old Kai shook his head: "No, this is too exhausting. I need to rest."

Yu Qian'an pulled Old Kai and said, "You really need to take a good rest and relax. Come on, I'll take you to rest."

Yu Qian'an took Old Kai directly to the hot spring where the female employee was staying: "Serve this old man well, and everyone will be rewarded with one million!"

Hearing this, the group of women pounced on them like hungry wolves seeing sheep.

Yu Qian'an found a quiet room in the rest area to carefully experience the results of his practice.

A day later, Xin returned to the Kaioshin Realm with the exhausted Old Kai. He looked at Yu Qian'an in confusion, "Did you really take Old Kaioshin to rest? Why does he look even more tired?"

Yu Qian'an took out a Senzu bean and fed it to Old Kai: "What happened before was just relaxation, and what's happening now is rest."

After taking one Senzu Bean, Old Kai immediately became energetic: "Yes, this medicine is super good for nourishing the kidneys!"

Yu Qian'an was speechless: "This person is the first to take Senzu Beans as an aphrodisiac. But if you think about it carefully, it seems quite reasonable!"

Then the spirited Old Kai began to improve Yang Jiarui's potential.

During this period, Yang Jiarui's combat power has never broken through the limit of 10 billion. I don't know if this is her limit or she is lazy. Anyway, after this upgrade, Yang Jiarui's combat power is estimated to be only a few billion, and she has completely become a member of the soy sauce party.

But she has Cell as her thug, so there is no need to worry about her safety. All that remains is to destroy Buu. However, Yu Qian'an actually likes Buu very much, especially Fat Buu. No matter how strong he is in combat, at least it is fun to have him around.