One Piece: Seaside System - Chapter 11: Marine Based -

After an unexpected accident, An Luo was reborn as the young master of a business family. Even as his grandfather’s favored grandson, he seems to only be a cannon fodder in the brothers’ struggle to seize power. However, the most frightening thing is… the strange emotions that flicker in his little brother’s eyes as he looks at him. At that moment, overwhelmed by his brother, An Luo angrily thought: Could it be that he is doomed to never escape this vicious cycle of “brotherly love”?

An Luo(frowning): After rebirth, I don’t want to be together with some strange person.

Someone(suddenly appearing in the back, smiling): What did older brother just say?

An Luo: …Nothing.

- Description from Novelupdates

The one single goal in life of the Strongest Old Sage is to subjugate the Demon King. In an epic final battle, both of them met their mutual destruction at each other’s hands.

However, the Demon King was not completely destroyed!

In order to destroy the Demon King once and for all; post-death, the Old Sage trains in the World of Gods and reincarnates as the Apostle of the Gods, Will.

In the reincarnated future, the Old Sage had become a legend and his former disciples hold the supreme authority in the world. The disciples had created an organization to oppose the Demon King and an academy to nurture the new generation of Heroes.

Thus the Apostle of the Gods, Will (8 year old), enrols into that Academy of Heroes.

This is the story of a boy on a mission to save the world through epic battles while enjoying Academy life.

I have a foster father…

Um, that’s not the important part. I just want to say, why doesn’t he understand the differences between boys and girls in this world? He insists a pornographic picture is actually a diagram of acupuncture points. And also…why did he raise me as a boy for 15 years?! It’s impressive that he can write prescriptions, but I studied poisons.

But, why is he a Fang Hua Beast…

Yan Ting: Life is no fun. What is the difference between life and death?

Li Zhao: Life is very happy.

The world in Yan Ting’s heart was very grey until he met Li Zhao. He thought this must be the liveliest person in the world. Otherwise, how could Li Zhao be so lively in his heart every day?

Very happy x Unhappy.

Warm text with entertainment circle elements.

- Description from Novelupdates