Seafolk

After they finished eating the food King left the house hurriedly.

Souta know why he's like that. He just watched him left hurriedly.

'I guess it's time for the sea king to appear' Souta thought.

He put his hand in his chin. 'Hmm? What should I do with Genos, the only way for him to get strong is to modified his boy'

"Ah!! I know" Souta exclaimed as he clapped his hands together. He looked at his system and at the shop. There's only a few items he could buy here.

"I found it" He exclaimed as he immediately bought it. There in his palm a blue stone appeared.

"Oi!! Genos come here" Souta shouted.

"What is it teacher?" Genos sat in front of him.

"Here!!" Souta throw the blue stone to Genos.

Genos caught it with his hand and looked at it.

"What's this teacher?" He asked Souta.

"That's called mana stone, tell Dr. Kuseno to modified your body and use this as a core " Souta explained to him.

"If finished, come to me, I will teach you" Souta said.

"Yes, teacher thank you very much for this." Genos said loudly.

"Go!!" Souta said.

"Yes teacher" Genos said as he immediately left.

'Atleast with this I'll be able to teach Genos how to fight using mana' Souta thought. He couldn't buy anything with his system his system after all. That's also the case with old man Ryan's system old man Ryan system could only give him a starter pack if he went to a different world, that's the strength of adaptive system. And with his system his strength depends with his summon.

He remembered the old man told him once that every system was like this, you could only buy an ordinary shop in your store except for those system with a with range store function that have more items in their system. That's why other people wanted to kill other system user to upgrade their system and obtain other benifits.

The adaptive system of old man have the function to removed the restrictions when you come to other world. The summoning system couldn't do that as it doesn't have that function. The summoning system strength doesn't lied in the host individual strength it lied in the strength of his summon, like the necromancer system. The necromancer system whole strength was an army of undead not the individual strength of the host.

When you fight the necromancer, be prepared to fight his whole army of dead that's what the old man told him.

Souta shook his head and turned his head to Saitama.

"Saitama, I'm going out for a while" Souta said to him.

"Okay" Saitama replied.

Souta opened the door and walked outside.

****

Souta walked around the city searching for monster.

'What should I do with King? He's one of my favorite character should I help him or not?' Souta thought while walking.

King was an S rank hero and was titled as the strongest man alive. But he know that King was just an ordinary person.

'And now I'm getting excited in promoting to a B rank' Souta thought excitedly.

He know the top ranker in B rank is Fubuki. He couldn't wait for the time he became an top ranker in B rank, with that Fubuki will visit him and will try to recruit him.

'Fubuki huh?' Souta thought as he laughed evilly.

Souta then spotted a commotion. He came over and found a monster, he subdue it earning some credits.

****

A week have passed quickly. Souta finally became a B rank hero. There's nothing note worthy that happened this week. It's just that Bang will visit occasionally and will talk to him and Saitama.

"Congratulations for becoming a B rank teacher" Genos said.

"Oh?! Genos how was the Mana stone?" Souta asked.

"Dr. Kuseno haven't finish examining the stone, he said that the stone contain some potent energy that could strengthen every living beings" Genos said.

"Well, that energy is called mana." Souta said.

"Okay, for now let's eat" Souta said as he sat down.

"Yes, teacher I'm going to call senior brother now" Genos said as he went out of the apartment.

Souta opened the television and went to the news channel.

[A group of mysterious monster appeared in J city, they call themselves merefolk]

"So, they are here" Souta said while watching the television.